CN104538827B - A kind of beam cleanup method and solid state laser based on Digital Holography - Google Patents
A kind of beam cleanup method and solid state laser based on Digital Holography Download PDFInfo
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- CN104538827B CN104538827B CN201410776555.5A CN201410776555A CN104538827B CN 104538827 B CN104538827 B CN 104538827B CN 201410776555 A CN201410776555 A CN 201410776555A CN 104538827 B CN104538827 B CN 104538827B
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Abstract
The present invention provides a kind of beam cleanup method and solid state laser based on digital hologram, and solid state laser includes：First polarization beam splitter prism, reflects a beacon beam, exports the reflected light of beacon beam；Multiple laser amplifier levels, the reflected light to beacon beam is amplified, amplification light of the output with phase distortion information；Second polarization beam splitter prism, for reflecting the amplification light with phase distortion information, output reflection light；CCD, interferes for projecting the reflected light and a reference light, and to reflected light and reference light, obtains digital hologram；Spatial light modulator, according to described local oscillator light of the digital hologram output with conjugate phase distribution character under the irradiation of an emergent light；Second polarization beam splitter prism, multiple laser amplifiers level, the first polarization beam splitter prism.The present invention to light laser wavefront without carrying out phase controlling, it is to avoid the thermal distoftion and fire damage of optical element, is adapted to the application in high power solid state laser.
Description
Technical field
The present invention is on field of laser device technology, especially with regard to the beam cleanup technology of solid state laser, concretely
It is a kind of beam cleanup method based on Digital Holography and solid state laser.
Background technology
In recent years, solid-state light laser technology achieves important breakthrough, and it has compact conformation, compact, electric power
The many advantages such as driving, pollution-free, with low cost, continuous emissivities are strong, and in industrial processes, national defense and military and scientific research
There is application demand widely Deng field.
Currently, the power level of the high light beam quality solid state laser of single gain host is in thousands of watts of magnitudes, even if using
Main oscillations-power amplification structure technology, the Solid State Laser link mean power of the nearly diffraction limit output in single port footpath also can only achieve
Tens of kilowatt magnitude.
Hartmann's wavefront sensing-distorting lens wavefront correction is alignment technique before ripe laser wave, is surveyed by real-time continuous
Determine the phase distortion of laser emitting wavefront, provide control signal as the distorting lens of wave-front corrector, and then improve transmitting laser
Beam quality.
But alignment technique uses distorting lens, tilting mirror etc. before laser wave of the prior art, due to distorting lens, tilt
The pixel of mirror is larger, and resolution ratio is low, and fill factor, curve factor is low, poor to the calibration result of high-order wavefront distortion.
The content of the invention
Use distorting lens, tilting mirror etc. to solve alignment technique before laser wave of the prior art, due to distorting lens,
The pixel of tilting mirror is larger, and resolution ratio is low, and fill factor, curve factor is low, the problem poor to the calibration result of high-order wavefront distortion, this hair
It is bright to provide a kind of beam cleanup method and solid state laser based on Digital Holography, utilize polarization beam splitter prism, many
Individual laser amplifier level is obtained the distortion brought in laser amplifier level due to laser medium thermal lensing effect, systematic error and passed through
CCD is recorded in digital hologram, and then the digital hologram is loaded into spatial light modulator, shone by emergent light
Obtained conjugation reproduction light is penetrated as local oscillator light and enters amplifying stage, high-quality laser output is obtained after amplifying step by step, without
Phase controlling is carried out to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, be adapted in high power laser system
Application.
It is an object of the invention to provide a kind of beam cleanup solid state laser based on Digital Holography, institute
The solid state laser stated includes：First polarization beam splitter prism, for reflecting a beacon beam, exports the anti-of the beacon beam
Penetrate light；Multiple laser amplifier levels, are amplified for the reflected light to the beacon beam, output putting with phase distortion information
Big light；Second polarization beam splitter prism, for reflecting the amplification light with phase distortion information, output reflection light；Image
Sensor CCD, interferes for projecting the reflected light and a reference light, and to described reflected light and reference light,
Obtain digital hologram；Described spatial light modulator, under the irradiation of an emergent light according to described digital hologram
Local oscillator light of the image output with conjugate phase distribution character；Second polarization beam splitter prism, for carrying conjugation phase to described
The local oscillator light of bit distribution characteristic is transmitted；Multiple laser amplifier levels, after being transmitted to second polarization beam splitter prism
Local oscillator light is amplified, output amplification light；First polarization beam splitter prism, for being exported after being transmitted to amplification light.
It is preferred that, described solid state laser also includes：Laser, for outgoing laser beam；Coupler, swashs with described
Light device is connected, for being a beacon beam and a reference light by described laser beam light splitting.
It is preferred that, described coupler is fiber coupler.
It is preferred that, the polarization direction of the beacon beam and reference light is perpendicular to paper.
It is preferred that, described solid state laser also includes：Main oscillations laser, for exporting an emergent light.
It is preferred that, the polarization direction of the emergent light is parallel to paper.
It is preferred that, if the reference light and CCD angle are the first angle, the folder of the emergent light and spatial light modulator
Angle is the second angle, then the first described angle is identical with the second angle number of degrees.
It is preferred that, the number of described multiple laser amplifiers level is 1 or 2 or 4 or 6.
It is preferred that, described solid state laser also includes：Control machine, for obtaining described digital hologram, and will
Described digital hologram is sent to spatial light modulator.
It is an object of the invention to provide a kind of beam cleanup method based on Digital Holography, described side
Method includes：First polarization beam splitter prism is reflected a beacon beam, exports the reflected light of the beacon beam；Multiple laser amplifiers
Level is amplified to the reflected light of the beacon beam, amplification light of the output with phase distortion information；Second polarization beam splitter prism
Amplification light with phase distortion information is reflected, output reflection light；CCD image sensor project the reflected light and
One reference light, and described reflected light and reference light are interfered, obtain digital hologram；Spatial light modulator is one
According to described local oscillator light of the digital hologram output with conjugate phase distribution character under the irradiation of emergent light；Second polarization
Beam splitter prism is transmitted to the described local oscillator light with conjugate phase distribution character；Multiple laser amplifier levels are to described second
Local oscillator light after polarization beam splitter prism transmission is amplified, output amplification light；First polarization beam splitter prism carries out saturating to amplification light
Penetrate, the light beam after output beam purification.
It is preferred that, described method also includes：Laser output laser beam；Described laser beam light splitting is one by coupler
Beacon beam and a reference light.
It is preferred that, described coupler is fiber coupler.
It is preferred that, the polarization direction of the beacon beam and reference light is perpendicular to paper.
It is preferred that, described method also includes：Main oscillations laser exports an emergent light.
It is preferred that, the polarization direction of the emergent light is parallel to paper.
It is preferred that, if the reference light and CCD angle are the first angle, the folder of the emergent light and spatial light modulator
Angle is the second angle, then the first described angle is identical with the second angle number of degrees.
It is preferred that, the number of described multiple laser amplifiers level is 1 or 2 or 4 or 6.
It is preferred that, described method also includes：Control machine obtains described digital hologram, and described numeral is complete
Breath image is sent to spatial light modulator.
The beneficial effects of the present invention are there is provided a kind of beam cleanup method based on Digital Holography and solid
Laser, using polarization beam splitter prism, multiple laser amplifiers level obtain laser amplifier level in due to laser medium thermal lensing effect,
Distortion that systematic error is brought simultaneously is recorded in digital hologram by CCD, and the digital hologram then is loaded into sky
Between on optical modulator, the conjugation obtained by main oscillations laser illumination, which reproduces light, is used as local oscillator light and enters amplifying stage, through step by step
The output of high-quality laser is obtained after amplification, without carrying out phase controlling to light laser wavefront, it is to avoid optical element it is hot abnormal
Become and fire damage, be adapted to the application in high power laser system.Using the digital hologram method of " digital record-optical reproduction ",
Digital hologram record and reproduction speed are improved, is adapted to adaptive optics application.Digital hologram collection is carried out with CCD, is had
Quickly, in real time, full filed the characteristics of, compared with traditional Hartmann wave front sensor collection wave front data, resolution ratio is carried significantly
Height, high-order wavefront distortion is gone out so as to accurately detecting.
For the above and other objects, features and advantages of the present invention can be become apparent, preferred embodiment cited below particularly,
And coordinate institute's accompanying drawings, it is described in detail below.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of embodiment one of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart；
Fig. 2 is a kind of embodiment two of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart；
Fig. 3 is a kind of embodiment three of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart；
Fig. 4 is a kind of embodiment four of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart；
Fig. 5 is a kind of implementation of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
The structural representation of mode one；
Fig. 6 is a kind of implementation of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
The structural representation of mode one；
Fig. 7 is a kind of implementation of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
The structural representation of mode one；
Fig. 8 is a kind of implementation of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
The structural representation of mode one.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The present invention is directed to alignment technique before laser wave of the prior art and uses distorting lens, tilting mirror etc., due to deformation
Mirror, tilting mirror pixel it is larger, resolution ratio is low, and fill factor, curve factor is low, the problem poor to the calibration result of high-order wavefront distortion, carries
Supplied a kind of beam cleanup method based on Digital Holography and solid state laser, using polarization beam splitter prism, it is multiple swash
Light amplification level is obtained the distortion brought in laser amplifier level due to laser medium thermal lensing effect, systematic error and remembered by CCD
The digital hologram is then loaded into spatial light modulator, obtained by outgoing light irradiation in digital hologram by record
To conjugation reproduce light and as local oscillator light enter amplifying stage, high-quality laser output is obtained after amplifying step by step, without to strong
Laser wave advance line phase is controlled, it is to avoid the thermal distoftion and fire damage of optical element, be adapted in high power laser system should
With.
Fig. 5 is a kind of structure of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
Block diagram, as shown in Figure 5, in embodiment one, described solid state laser includes：
First polarization beam splitter prism 100, for a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
Multiple laser amplifier levels 200, for the reflected light R to the beacon beam3It is amplified, output carries phase distortion
The amplification light R of information4；
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information4Reflected, output reflection
Light R5；
CCD image sensor 400, for projecting the reflected light R5And a reference light R6, and to described reflected light R5
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.
Spatial light modulator 500, in an emergent light R7Irradiation under band is exported according to described digital hologram
There is the local oscillator light R of conjugate phase distribution character8；
Second polarization beam splitter prism 300, for the described local oscillator light R with conjugate phase distribution character8Carry out saturating
Penetrate；
Multiple laser amplifier levels 200, for the local oscillator light R after second polarization beam splitter prism transmission9It is amplified,
Output amplification light R10；
First polarization beam splitter prism 100, for amplification light R10Exported after being transmitted, obtain R11.R herein11For warp
The light beam exported after beam cleanup is crossed, high-quality laser output is realized.
As described above, be a kind of solid state laser based on Digital Holography for providing of the present invention, using first, the
Two polarization beam splitter prisms, multiple laser amplifiers level are obtained in laser amplifier level due to laser medium thermal lensing effect, systematic error
The distortion that brings simultaneously is recorded in digital hologram by CCD, and the digital hologram then is loaded into space light modulation
On device, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, obtains high-quality after amplifying step by step
The laser output of amount, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is adapted to
Application in high power laser system.
Fig. 6 is a kind of structure of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
Block diagram, it will be appreciated from fig. 6 that in embodiment two, described solid state laser includes：
Laser 600, for outgoing laser beam R1；
Coupler 700, is connected with described laser 600, for by described laser beam R1Light splitting is a beacon beam R2
With a reference light R6.In a particular embodiment, described coupler is fiber coupler.The beacon beam R2And reference light
R6Polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
Multiple laser amplifier levels 200, for the reflected light R to the beacon beam3It is amplified, output carries phase distortion
The amplification light R of information4；
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information4Reflected, output reflection
Light R5；
CCD image sensor 400, for projecting the reflected light R5And a reference light R6, and to described reflected light R5
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
Spatial light modulator 500, in an emergent light R7Irradiation under this is exported according to described digital hologram
Shake light R8；
Second polarization beam splitter prism 300, for described local oscillator light R8Transmitted；
Multiple laser amplifier levels 200, for the local oscillator light R after second polarization beam splitter prism transmission9It is amplified,
Amplification light R of the output with conjugation item phase distribution characteristic10；
First polarization beam splitter prism 100, for the amplification light R with conjugation item phase distribution characteristic10After being transmitted
Output, obtains R11.R herein11For the light beam exported after beam cleanup, high-quality laser output is realized.
As described above, be a kind of solid state laser based on Digital Holography for providing of the present invention, using first, the
Two polarization beam splitter prisms, multiple laser amplifiers level are obtained in laser amplifier level due to laser medium thermal lensing effect, systematic error
The distortion that brings simultaneously is recorded in digital hologram by CCD, and the digital hologram then is loaded into space light modulation
On device, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, obtains high-quality after amplifying step by step
The laser output of amount, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is adapted to
Application in high power laser system.
Fig. 7 is a kind of structure of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
Block diagram, as shown in Figure 7, in embodiment three, described solid state laser includes：
Laser 600, for outgoing laser beam R1；
Coupler 700, is connected with described laser 600, for by described laser beam R1Light splitting is a beacon beam R2
With a reference light R6.In a particular embodiment, described coupler is fiber coupler.The beacon beam R2And reference light
R6Polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
Multiple laser amplifier levels 200, for the reflected light R to the beacon beam3It is amplified, output carries phase distortion
The amplification light R of information4；
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information4Reflected, output reflection
Light R5；
CCD image sensor 400, for projecting the reflected light R5And a reference light R6, and to described reflected light R5
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
Main oscillations laser 800, for exporting an emergent light R7.The polarization direction of the emergent light is parallel to paper.
Spatial light modulator 500, in an emergent light R7Irradiation under this is exported according to described digital hologram
Shake light R8；
Second polarization beam splitter prism 300, for described local oscillator light R8Transmitted；
Multiple laser amplifier levels 200, for the local oscillator light R after second polarization beam splitter prism transmission9It is amplified,
Amplification light R of the output with conjugation item phase distribution characteristic10；
First polarization beam splitter prism 100, for the amplification light R with conjugation item phase distribution characteristic10After being transmitted
Output, obtains R11.R herein11For the light beam exported after beam cleanup, high-quality laser output is realized.
As described above, be a kind of solid state laser based on Digital Holography for providing of the present invention, using first, the
Two polarization beam splitter prisms, multiple laser amplifiers level are obtained in laser amplifier level due to laser medium thermal lensing effect, systematic error
The distortion that brings simultaneously is recorded in digital hologram by CCD, and the digital hologram then is loaded into space light modulation
On device, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, obtains high-quality after amplifying step by step
The laser output of amount, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is adapted to
Application in high power laser system.
Fig. 8 is a kind of structure of the beam cleanup solid state laser based on Digital Holography provided in an embodiment of the present invention
Block diagram, as shown in Figure 8, in embodiment four, described solid state laser includes：
Laser 600, for outgoing laser beam R1；
Coupler 700, is connected with described laser 600, for by described laser beam R1Light splitting is a beacon beam R2
With a reference light R6.In a particular embodiment, described coupler is fiber coupler.The beacon beam R2And reference light
R6Polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
Multiple laser amplifier levels 200, for the reflected light R to the beacon beam3It is amplified, output carries phase distortion
The amplification light R of information4；
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information4Reflected, output reflection
Light R5；
CCD image sensor 400, for projecting the reflected light R5And a reference light R6, and to described reflected light R5
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
Control machine 900, for obtaining described digital hologram, and described digital hologram is sent to space
Optical modulator.
Main oscillations laser 800, for exporting an emergent light R7.The polarization direction of the emergent light is parallel to paper.
Spatial light modulator 500, in an emergent light R7Irradiation under this is exported according to described digital hologram
Shake light R8；
Second polarization beam splitter prism 300, for described local oscillator light R8Transmitted；
Multiple laser amplifier levels 200, for the local oscillator light R after second polarization beam splitter prism transmission9It is amplified,
Amplification light R of the output with conjugation item phase distribution characteristic10；
First polarization beam splitter prism 100, for the amplification light R with conjugation item phase distribution characteristic10After being transmitted
Output, obtains R11.R herein11For the light beam exported after beam cleanup, high-quality laser output is realized.
Digital hologram is loaded into spatial light modulator, with main oscillations laser emitting light R7(put down polarization direction
Row is transmitted in paper on polarization beam splitter prism) illumination reproduces hologram, using the conjugation phase distribution of its reproducing for-
Ф characteristic, as in local oscillator light from right to left injection amplification level, obtains high-quality laser output after amplifying step by step.If institute
The angle for stating reference light and CCD is the first angle, and the angle of the emergent light and spatial light modulator is the second angle, then described
The first angle it is identical with the second angle number of degrees.In a particular embodiment, the number of described multiple laser amplifiers level is 1
Individual or 2 or 4 or 6
Beacon optical input power wants sufficiently small in this scenario does not influence laser amplifier level normal work with guarantee.
As described above, being a kind of solid state laser based on Digital Holography that the present invention is provided, beacon beam (polarization
Direction is reflected perpendicular to paper on polarization beam splitter prism) it is divided into two-way, wherein beacon beam is anti-by the first polarization beam splitter prism
Phase distortion information Ф in laser amplifier level is carried after penetrating to be reflected by the second polarization beam splitter prism, and with reference to the interference of light and in camera
On record digital hologram；Digital hologram is loaded into spatial light modulator, with main oscillations laser emitting light (polarization
Paper is oriented parallel to, is transmitted on polarization beam splitter prism) illumination reproduction hologram, utilize the conjugation phase point of its reproducing
Cloth is-Ф characteristic, as in local oscillator light from right to left injection amplification level, high-quality laser is obtained after amplifying step by step defeated
Go out.
Fig. 1 is a kind of embodiment one of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart, as shown in Figure 1, in embodiment one, described method includes：
S101：First polarization beam splitter prism is to a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
S102：Reflected light R of multiple laser amplifier levels to the beacon beam3It is amplified, output is with phase distortion letter
The amplification light R of breath4；
S103：Second polarization beam splitter prism is to the amplification light R with phase distortion information4Reflected, output reflection light
R5；
S104：CCD image sensor projects the reflected light R5And a reference light R6, and to described reflected light R5With
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.
S105：Spatial light modulator is in an emergent light R7Irradiation under according to described digital hologram output with altogether
The local oscillator light R of yoke phase distribution characteristic8；
S106：Second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character8Transmitted；
S107：Local oscillator light R after multiple 200 pairs of laser amplifier level the second polarization beam splitter prism transmissions9It is amplified,
Output amplification light R10；
S108：The amplification light R of first polarization beam splitter prism pair10Exported after being transmitted, obtain R11.R herein11For warp
The light beam exported after beam cleanup is crossed, high-quality laser output is realized.
As described above, be a kind of beam cleanup method based on Digital Holography for providing of the present invention, using first,
Second polarization beam splitter prism, multiple laser amplifiers level are obtained in laser amplifier level because laser medium thermal lensing effect, system are missed
The next distortion of difference band is simultaneously recorded in digital hologram by CCD, and the digital hologram then is loaded into spatial light adjusts
On device processed, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, and height is obtained after amplifying step by step
The laser output of quality, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is fitted
Close the application in high power laser system.
Fig. 2 is a kind of embodiment two of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart, as shown in Figure 2, in embodiment two, described method includes：
S201：Laser output laser beam R1；
S202：Coupler is by described laser beam R1Light splitting is a beacon beam R2With a reference light R6.In specific embodiment party
In formula, described coupler is fiber coupler.The beacon beam R2With reference light R6Polarization direction perpendicular to paper.
S203：First 100 pair one of polarization beam splitter prism beacon beam R2Reflected, export the reflected light R of the beacon beam3；
S204：The reflected light R of 200 pairs of beacon beams of multiple laser amplifier levels3It is amplified, output carries phase distortion
The amplification light R of information4；
S205：Second polarization beam splitter prism is to the amplification light R with phase distortion information4Reflected, output reflection light
R5；
S206：CCD image sensor projects the reflected light R5And a reference light R6, and to described reflected light R5With
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
S207：Spatial light modulator is in an emergent light R7Irradiation under according to described digital hologram output with altogether
The local oscillator light R of yoke phase distribution characteristic8；
S208：Second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character8Transmitted；
S209：Multiple laser amplifier levels are to the local oscillator light R after second polarization beam splitter prism transmission9It is amplified, it is defeated
Go out to amplify light R10；
S210：First polarization beam splitter prism is to amplification light R10Exported after being transmitted, obtain R11.R herein11To pass through
The light beam exported after beam cleanup, realizes high-quality laser output.
As described above, be a kind of beam cleanup method based on Digital Holography for providing of the present invention, using first,
Second polarization beam splitter prism, multiple laser amplifiers level are obtained in laser amplifier level because laser medium thermal lensing effect, system are missed
The next distortion of difference band is simultaneously recorded in digital hologram by CCD, and the digital hologram then is loaded into spatial light adjusts
On device processed, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, and height is obtained after amplifying step by step
The laser output of quality, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is fitted
Close the application in high power laser system.
Fig. 3 is a kind of embodiment three of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart, from the figure 3, it may be seen that in embodiment three, described method includes：
S301：Laser output laser beam R1；
S302：Coupler is by described laser beam R1Light splitting is a beacon beam R2With a reference light R6.In specific embodiment party
In formula, described coupler is fiber coupler.The beacon beam R2With reference light R6Polarization direction perpendicular to paper.
S303：First polarization beam splitter prism is to a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
S304：Reflected light R of multiple laser amplifier levels to the beacon beam3It is amplified, output is with phase distortion letter
The amplification light R of breath4；
S305：Second polarization beam splitter prism is to the amplification light R with phase distortion information4Reflected, output reflection light
R5；
S306：CCD image sensor projects the reflected light R5And a reference light R6, and to described reflected light R5With
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
S307：Main oscillations laser exports an emergent light R7.The polarization direction of the emergent light is parallel to paper.
S308：Spatial light modulator is in an emergent light R7Irradiation under according to described digital hologram output with altogether
The local oscillator light R of yoke phase distribution characteristic8；
S309：Second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character8Transmitted；
S310：Multiple laser amplifier levels are to the local oscillator light R after second polarization beam splitter prism transmission9It is amplified, it is defeated
Go out to amplify light R10；
S311：First polarization beam splitter prism is to amplification light R10Exported after being transmitted, obtain R11.R herein11To pass through
The light beam exported after beam cleanup, realizes high-quality laser output.
As described above, be a kind of beam cleanup method based on Digital Holography for providing of the present invention, using first,
Second polarization beam splitter prism, multiple laser amplifiers level are obtained in laser amplifier level because laser medium thermal lensing effect, system are missed
The next distortion of difference band is simultaneously recorded in digital hologram by CCD, and the digital hologram then is loaded into spatial light adjusts
On device processed, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, and height is obtained after amplifying step by step
The laser output of quality, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion and fire damage of optical element, is fitted
Close the application in high power laser system.
Fig. 4 is a kind of embodiment four of the beam cleanup method based on Digital Holography provided in an embodiment of the present invention
Flow chart, as shown in Figure 4, in embodiment four, described method includes：
S401：Laser output laser beam R1；
S402：Coupler is by described laser beam R1Light splitting is a beacon beam R2With a reference light R6.In specific embodiment party
In formula, described coupler is fiber coupler.The beacon beam R2With reference light R6Polarization direction perpendicular to paper.
S403：First polarization beam splitter prism is to a beacon beam R2Reflected, export the reflected light R of the beacon beam3；
S404：Reflected light R of multiple laser amplifier levels to the beacon beam3It is amplified, output is with phase distortion letter
The amplification light R of breath4；
S405：Second polarization beam splitter prism is to the amplification light R with phase distortion information4Reflected, output reflection light
R5；
S406：CCD image sensor projects the reflected light R5And a reference light R6, and to described reflected light R5With
And reference light R6Interfered, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique are combined, tool
There is the advantage of quick, real-time, full filed and quantitative phase contrast imaging.Digital hologram adaptive optical technique belongs to Digital Holography
One of newest application field.Specific to the present invention, beacon beam R2Laser is carried after being reflected by the first polarization beam splitter prism to put
Phase distortion information Ф is reflected by the second polarization beam splitter prism in big level, and reference light R6Interfere and numeral is recorded on camera
Hologram.
S407：Control machine obtains described digital hologram, and described digital hologram is sent to spatial light
Modulator.
S408：Main oscillations laser exports an emergent light R7.The polarization direction of the emergent light is parallel to paper.
S409：Spatial light modulator is in an emergent light R7Irradiation under according to described digital hologram output with altogether
The local oscillator light R of yoke phase distribution characteristic8；
S410：Second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character8Transmitted；
S411：Multiple laser amplifier levels are to the local oscillator light R after second polarization beam splitter prism transmission9It is amplified, it is defeated
Go out to amplify light R10；
S412：First polarization beam splitter prism is to amplification light R10Exported after being transmitted, obtain R11.R herein11To pass through
The light beam exported after beam cleanup, realizes high-quality laser output.
Digital hologram is loaded into spatial light modulator, with main oscillations laser emitting light R7(put down polarization direction
Row is transmitted in paper on polarization beam splitter prism) illumination reproduces hologram, using the conjugation phase distribution of its reproducing for-
Ф characteristic, as in local oscillator light from right to left injection amplification level, obtains high-quality laser output after amplifying step by step.If institute
The angle for stating reference light and CCD is the first angle, and the angle of the emergent light and spatial light modulator is the second angle, then described
The first angle it is identical with the second angle number of degrees.In a particular embodiment, the number of described multiple laser amplifiers level is 1
Individual or 2 or 4 or 6
Beacon optical input power wants sufficiently small in this scenario does not influence laser amplifier level normal work with guarantee.
As described above, being a kind of beam cleanup method based on Digital Holography that the present invention is provided, beacon beam is (partially
Direction shake perpendicular to paper, is reflected on polarization beam splitter prism) it is divided into two-way, wherein beacon beam is by the first polarization beam splitter prism
Phase distortion information Ф in laser amplifier level is carried after reflection to be reflected by the second polarization beam splitter prism, and with reference to the interference of light and in phase
Digital hologram is recorded on machine；Digital hologram is loaded into spatial light modulator, with main oscillations laser emitting light (partially
Shake and be oriented parallel to paper, transmitted on polarization beam splitter prism) illumination reproduction hologram, utilize the conjugation phase of its reproducing
- Ф characteristic is distributed as, as in local oscillator light from right to left injection amplification level, high-quality laser is obtained after amplifying step by step defeated
Go out.
With reference to specific embodiment, technical scheme is discussed in detail.Main research numeral of the invention
Holographic method, in placing (MOPA) laser system greatly in local oscillator, is obtained in laser amplifier level due to swashing using light is detected
Distortion that optical medium thermal lensing effect, systematic error are brought simultaneously is recorded in the hologram, is then loaded into the digital hologram
On transmission-type amplitude type LCD space light modulator, the conjugation obtained with local oscillator laser emitting light irradiation reproduces light as local oscillator
Light enters amplifying stage, and high-quality laser output is obtained after amplifying step by step.
In a particular embodiment, diode pumping Nd：YAG laser, single pulse energy 300mJ, repetition 200Hz,
Pulse width 10ns, optical design is implemented according to this programme, uses Thorlabs CCD, 4.65 μm * 4.65 μm of pixel count, pixel
Number 1280*1024；Reallight LCD space light modulators, pixel count 1024*768,18 μm of Pixel Dimensions.Laser passes through
RMS is less than three/wavelength before output wave after beam cleanup, realizes high-quality laser output.
In summary, the invention provides a kind of beam cleanup method based on Digital Holography and Solid State Laser
Device, is obtained in laser amplifier level due to laser medium thermal lens using first, second polarization beam splitter prism, multiple laser amplifiers level
Distortion that effect, systematic error are brought simultaneously is recorded in digital hologram by CCD, is then loaded the digital hologram
Onto spatial light modulator, the conjugation reproduction light obtained by outgoing light irradiation is used as local oscillator light and enters amplifying stage, through putting step by step
High-quality laser output is obtained after big, without carrying out phase controlling to light laser wavefront, it is to avoid the thermal distoftion of optical element
And fire damage, it is adapted to the application in high power laser system.
The beneficial effects of the present invention are：
1. carry out digital hologram collection with CCD, the characteristics of with quick, real-time, full filed, and traditional Hartmann's ripple
Front sensor collection wave front data is compared, and resolution ratio is greatly improved, and high-order wavefront distortion is gone out so as to accurately detecting.
2. using amplitude type transmission liquid crystal spatial light modulator, its high resolution, correction accuracy is high, can correct higher order wave
Front-distortion, forms high-quality laser output.
3. using the digital hologram method of " digital record-optical reproduction ", digital hologram record and reproduction speed are improved,
It is adapted to adaptive optics application.
4. without carrying out phase controlling to light laser wavefront in the program, it is to avoid the thermal distoftion and heat waste of optical element
Wound, is adapted to the application in high power laser system.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, Ke Yitong
Cross computer program to instruct the hardware of correlation to complete, described program can be stored in general computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Those skilled in the art will also be appreciated that the various functions that the embodiment of the present invention is listed are by hardware or soft
Part depends on the design requirement of specific application and whole solid state laser to realize.Those skilled in the art can be for every kind of
Specific application, the function that various methods realizations can be used described, but this realization are understood not to beyond the present invention in fact
Apply the scope of example protection.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help to understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art,
According to the thought of the present invention, it will change in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (16)
1. a kind of solid state laser based on Digital Holography, it is characterized in that, described solid state laser includes：
Laser, for outgoing laser beam；
Coupler, is connected with described laser, for being a beacon beam and a reference light by described laser beam light splitting；
First polarization beam splitter prism, for reflecting the beacon beam, exports the reflected light of the beacon beam；
Multiple laser amplifier levels, are amplified for the reflected light to the beacon beam, output putting with phase distortion information
Big light；
Second polarization beam splitter prism, for reflecting the amplification light with phase distortion information, output reflection light；
CCD image sensor, for projecting the reflected light and the reference light, and to described reflected light and reference light
Interfered, obtain digital hologram；
Spatial light modulator, for carrying conjugate phase according to described digital hologram output under the irradiation of an emergent light
The local oscillator light of distribution character；
Second polarization beam splitter prism, for being transmitted to the described local oscillator light with conjugate phase distribution character；
Multiple laser amplifier levels, are amplified for the local oscillator light after being transmitted to second polarization beam splitter prism, output amplification
Light；
First polarization beam splitter prism, for being exported after being transmitted to amplification light.
2. the solid state laser according to claim 1 based on Digital Holography, it is characterized in that, described coupler is
Fiber coupler.
3. the solid state laser according to claim 1 based on Digital Holography, it is characterized in that, the beacon beam and ginseng
The polarization direction of light is examined perpendicular to paper.
4. the solid state laser according to claim 1 based on Digital Holography, it is characterized in that, described Solid State Laser
Device also includes：
Main oscillations laser, for exporting an emergent light.
5. the solid state laser according to claim 4 based on Digital Holography, it is characterized in that, the emergent light it is inclined
Shake and be oriented parallel to paper.
6. the solid state laser based on Digital Holography according to claim 1 or 4, it is characterized in that：
If the reference light and CCD angle are the first angle, the angle of the emergent light and spatial light modulator is the second folder
Angle, then the first described angle is identical with the second angle number of degrees.
7. the solid state laser according to claim 6 based on Digital Holography, it is characterized in that, described multiple laser
The number of amplifying stage is 1 or 2 or 4 or 6.
8. the solid state laser according to claim 7 based on Digital Holography, it is characterized in that, described Solid State Laser
Device also includes：
Control machine, for obtaining described digital hologram, and described digital hologram is sent to space light modulation
Device.
9. a kind of beam cleanup method based on Digital Holography, it is characterized in that, described method includes：
Laser output laser beam；
Described laser beam light splitting is a beacon beam and a reference light by coupler；
First polarization beam splitter prism is reflected the beacon beam, exports the reflected light of the beacon beam；
Multiple laser amplifier levels are amplified to the reflected light of the beacon beam, amplification light of the output with phase distortion information；
Second polarization beam splitter prism is reflected the amplification light with phase distortion information, output reflection light；
CCD image sensor projects the reflected light and the reference light, and described reflected light and reference light are carried out
Interference, obtains digital hologram；
Spatial light modulator is under the irradiation of an emergent light according to described digital hologram output with conjugate phase distribution
The local oscillator light of characteristic；
Second polarization beam splitter prism is transmitted to the described local oscillator light with conjugate phase distribution character；
Local oscillator light after multiple laser amplifier levels are transmitted to second polarization beam splitter prism is amplified, output amplification light；
First polarization beam splitter prism is transmitted to amplification light, the light beam after output beam purification.
10. method according to claim 9, it is characterized in that, described coupler is fiber coupler.
11. method according to claim 9, it is characterized in that, the polarization direction of the beacon beam and reference light is perpendicular to paper
Face.
12. method according to claim 9, it is characterized in that, described method also includes：
Main oscillations laser exports an emergent light.
13. method according to claim 12, it is characterized in that, the polarization direction of the emergent light is parallel to paper.
14. the method according to claim 9 or 12, it is characterized in that：
If the reference light and CCD angle are the first angle, the angle of the emergent light and spatial light modulator is the second folder
Angle, then the first described angle is identical with the second angle number of degrees.
15. method according to claim 14, it is characterized in that, the number of described multiple laser amplifiers level is 1 or 2
Or 4 or 6.
16. method according to claim 15, it is characterized in that, described method also includes：
Control machine obtains described digital hologram, and described digital hologram is sent to spatial light modulator.
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| KR101200943B1 (en) * | 2010-04-06 | 2012-11-13 | 한국과학기술원 | High-energy laser system intercepting a target and method thereof |
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| CN1259236A (en) * | 1997-06-06 | 2000-07-05 | 托山纳有限公司 | Laser systems using phase conjugate feedback |
| CN101916570A (en) * | 2010-07-02 | 2010-12-15 | 中国科学院上海光学精密机械研究所 | Synthetic Aperture Femtosecond Pulse Digital Holographic Recording Device |
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