CN108666854A - A kind of picosecond laser - Google Patents
A kind of picosecond laser Download PDFInfo
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- CN108666854A CN108666854A CN201810908080.9A CN201810908080A CN108666854A CN 108666854 A CN108666854 A CN 108666854A CN 201810908080 A CN201810908080 A CN 201810908080A CN 108666854 A CN108666854 A CN 108666854A
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- 230000003321 amplification Effects 0.000 claims abstract description 58
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 58
- 230000006835 compression Effects 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 45
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 31
- 230000003287 optical effect Effects 0.000 claims description 23
- 230000010355 oscillation Effects 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 5
- 230000011514 reflex Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 9
- 238000009834 vaporization Methods 0.000 description 8
- 230000008016 vaporization Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 206010044565 Tremor Diseases 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 208000003351 Melanosis Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 208000035475 disorder Diseases 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lasers (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of picosecond lasers, including seed laser component, Pulse Compression component, the laser that seed laser component exports is compressed to ps grades by the Pulse Compression component, and picosecond laser also has energy amplifier module, the energy amplifier module has two laser bars being distributed along light path, and the laser being transmitted in the energy amplifier module is at least through light extraction after the amplification twice of laser bar described in one of them.The picosecond laser of the present invention has seed laser component, Pulse Compression component and energy amplifier module, it is externally exported after the compressed laser of pulsewidth compression assembly is amplified by energy amplifier module, wherein, the energy amplifier module laser of the present invention is along light path at least through the enhanced processing twice of a laser bar, the laser of acquisition has large energy, to meet requirement.
Description
Technical field
The present invention relates to technical field of optical instrument more particularly to a kind of picosecond lasers.
Background technology
In recent years, the continuous technological innovation of laser medicine product for treating Skin pigment abnormalities, from energy, light
Have very big breakthrough on spot pattern, pulsewidth shorten to nearly 10 times of picosecond laser of traditional Q machines, at last maximum technology into
Step, picosecond laser single pulse energy herein is nearly thousand times high compared with the picosecond laser in industrial processes, can treat tradition Q machines and not control
Pigment disorders.The picosecond laser of this big energy has clinical advantage outstanding on medical and beauty treatment.
A kind of picosecond laser that the output of hundred picoseconds of pulsewidths can be achieved is disclosed in the prior art, and seed source laser generates
Nanosecond laser first pass around single channel round trip laser bar being placed in parallel with seed source laser bar and realize that energy is put for the first time
Greatly, amplified laser passes sequentially through a series of optical devices arranged in optical transmission direction, optical transmission direction and transmission shape
Repeatedly variation occurs for formula, eventually enters into SBS medium pools and realizes compression, compressed laser is again by aforementioned single channel round trip laser
Stick realizes the secondary amplification of energy, and the output of picosecond laser is carried out finally by upstream light path.
The shortcomings that this structure, is：Seed light is by expanding and after energy amplification, the threshold of stimulated Brillouin scattering occurring
It is worth relatively high, laser threshold is easy to generate partial vaporization point, partial vaporization point week near focal point generally in 100mJ or more
It can go bad after the energy of the Absorption of Medium laser enclosed and generate many micro-bubbles, this can reduce the service life of SBS, and the light exported
Impulse waveform generates prodigious pulsation, the serious output stability for reducing laser.
Invention content
It is an object of the invention to the layouts by reasonable arrangement compression stage and amplifying stage, make SBS media in the course of work
In will not vaporize and cause output waveform unstable.Therefore ensure the picosecond laser energy into before amplifying stage and pulse width strictly not
Variation controls the size that entire laser exports energy by being delayed between amplification system grade, ensures to export energy in laser
The thermal focal of laser is stablized in adjustment process, and laser divergence angle is constant when energy change.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of picosecond laser disclosed by the invention, including：
Seed laser component, the seed laser component is generating and export seed laser；
The seed laser line focus mirror of Pulse Compression component, the seed laser component output is exported to the Pulse Compression
Component, and the Pulse Compression component is by the Pulse Compression of seed laser；
Light path between the seed laser component and Pulse Compression component has the second polarizing film and third a quarter
Wave plate, the horizontal linear polarization ray laser through seed laser component output is through the second polarizing film and through third quarter-wave
Become circular polarization light wave after piece, the Pulse Compression component has a reflection focus lamp far from the second polarizing film one end, through institute
State the focus lamp convergence of Pulse Compression component laser beam reach after the reflection focus lamp SBS medium pools internal focus simultaneously
Along backtracking, reversed Stokes laser that the Pulse Compression component the generates shape after the third quarter-wave plate
It reflects as vertical polarization laser and through the second polarizing film and exports；
Also there is the picosecond laser energy amplifier module, the energy amplifier module to receive the second polarizing film reflection
Laser, and output is amplified to the laser；
The energy amplifier module has two laser bars being distributed along light path, and is transmitted in the energy amplifier module
Laser at least through light extraction after the amplification twice of laser bar described in one of them.
Further, the seed laser component is by the first total reflection mirror, aperture, Q-switch component, the first polarization
Piece, the first quarter-wave plate, first laser stick, the second quarter-wave plate and outgoing mirror composition, the seed laser component
Output beam is horizontal linear polarization laser beam.
Further, there is expand unit between the Pulse Compression component and the energy amplifier module；
The expand unit includes receiving the vertical polarization laser reflected by the first speculum and entering beam expanding lens group, through institute
It states after expanding the vertical polarization laser after microscope group expands by second orifice diaphragm progress shrink beam, becomes after half wave plate
For horizontal oscillations laser, energy amplifier module is entered after horizontal oscillations laser light third polarizing film.
Further, the energy amplifier module includes the second laser for the laser for receiving the third polarizing film output
Stick, the laser through second laser stick amplification are transmitted to third laser bar by the second speculum, third speculum and carry out energy
The laser of amount amplification, the third laser bar output is transmitted to the second total reflective mirror, and described second through the 4th quarter-wave plate
Total reflective mirror will be transmitted to the laser at this and be reflected along original optical path, again passes by become after the 4th quarter-wave plate polarizing vertically and swash
Light, the vertical polarization laser successively by third laser bar and second laser stick to after carrying out energy secondary amplification through described
The reflection of three polarizing films is exported to outside.
Further, there is the gyrotropi crystal laid along light path between the second laser stick and third laser bar.
Further, the energy amplifier module includes the second laser for the laser for receiving the third polarizing film output
Stick, the laser amplified through the second laser stick are transmitted to third total reflective mirror, third total reflective mirror by the 5th quarter-wave plate
It will be transmitted to laser thereon and reflected along original optical path and again pass by become to polarize vertically after the 5th quarter-wave plate and swash
Light carries out second energy amplification by second laser stick, and amplified laser reflexes to the 4th speculum by third polarizing film,
The laser reflected through the 4th speculum passes sequentially through half wave plate and the 4th polarizing film is transmitted in third laser bar
Carry out energy amplification；
It is anti-through the 4th total reflective mirror after the amplified laser of third laser bar energy is by the 6th quarter-wave plate
It penetrates and becomes vertical polarization laser after again passing by the 6th quarter-wave plate, which polarizes via the described 4th
Piece reflection is exported to outside.
Further, the energy amplifier module includes the second laser for the laser for receiving the third polarizing film output
Stick carries out energy amplification through the second laser stick, and it is complete that amplified laser by the 5th quarter-wave plate is transmitted to third
Speculum, third total reflection mirror will be transmitted to laser thereon and reflected along original optical path and again pass by the 5th quarter-wave
Become vertical polarization laser after piece, carries out energy secondary amplification through second laser stick, amplified light beam passes through third polarizing film
The 4th speculum is reflexed to, the laser reflected through the 4th speculum passes sequentially through half wave plate and the 4th polarizing film passes
It transports in third laser bar and carries out energy amplification and export to outside.
Further, the energy amplifier module includes the second laser stick for receiving the third polarizing film output, described
The amplified laser of second laser stick is successively by the 4th speculum and the 5th speculum and through entering the after the 4th polarizing film
Three laser amplifier sticks carry out energy amplification, and amplified laser transports to the 4th total reflection mirror by the 5th quarter-wave plate, the
Four total reflection mirrors will be transmitted to laser thereon and be reflected along original optical path and become vertical after again passing by the 5th quarter-wave plate
The laser of polarization passes through the 4th polarizing film reflection output to outside after third laser bar is amplified.
In the above-mentioned technical solutions, a kind of picosecond laser provided by the invention, has the advantages that：
1, the layout of reasonable arrangement compression stage and amplifying stage makes SBS medium pools not vaporize during the work time, ensures arteries and veins
Output energy and pulsewidth are stablized (before entering energy amplifier) after width compression；
2, the size of output energy is controlled by being delayed between amplification system grade, ensures to export energy adjustment mistake in laser
Cheng Zhong, pulse width do not change strictly, and the thermal focal of laser is stablized.
Stimulated Brillouin scattering threshold value can be reached near focus point after light beam enters SBS medium pools, generate reversed pass
Defeated stokes light, stokes light compress laser pulse width in transmission process.
Seed laser exports the general very little of energy, and typically less than 10mJ is directly entered SBS medium pools and forms excited Brillouin
Threshold value when scattering is relatively small, and threshold value is generally less than 3mJ at this time, will not generate partial vaporization near laser spot and make defeated
Go out beam shape shakiness, the prodigious situation of pulse width variations；But seed light is by expanding and after energy amplification, excited Brillouin occurring
The threshold value of scattering is relatively high, and threshold value is easy to generate partial vaporization point, partial vaporization near focal point generally in 100mJ or more
It can go bad after the energy of Absorption of Medium laser around point and generate many micro-bubbles, medium is rotten to reduce SBS medium pools
Service life, bubble can influence light transmission, and it is prodigious that energy by Absorption of Medium makes the optical pulse energy of output and pulsewidth generate
Pulsation, the serious output stability for reducing laser.This layout is that the application is different from other based on SBS progress Pulse Compressions
Salient the most.
In carrying out energy amplification process, the pulsewidth of laser, angle of divergence polarization state etc. will not all change laser, be only energy
Increase.
As stated above, (seed laser of a few mJ outputs energy is introduced into SBS for the topology layout of picosecond laser of the invention
Enter amplifying stage afterwards) in open source information at home and abroad beyond example.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only one described in the present invention
A little embodiments, for those of ordinary skill in the art, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of light path principle figure of the first embodiment of picosecond laser disclosed by the invention；
Fig. 2 is that a kind of light path of the energy amplifier module of second of embodiment of picosecond laser disclosed by the invention is former
Reason figure；
Fig. 3 is that a kind of light path of the energy amplifier module of the third embodiment of picosecond laser disclosed by the invention is former
Reason figure；
Fig. 4 is that a kind of light path of the energy amplifier module of the 4th kind of embodiment of picosecond laser disclosed by the invention is former
Reason figure.
Reference sign：
1, seed laser component；2, Pulse Compression component；3, energy amplifier module；4, the second polarizing film；5, the three or four point
One of wave plate；6, the first speculum；7, microscope group is expanded；8, second orifice diaphragm；9, half wave plate；10, third polarizing film；
11, the 4th polarizing film；12, the 5th quarter-wave plate；13, third total reflective mirror；14, the 4th total reflective mirror；15, the 4th speculum；
16, the 5th speculum；17, the 6th quarter-wave plate；
101, the first total reflective mirror；102, the first aperture；103, Q-switch component；104, the first polarizing film；105, first
Quarter-wave plate；106, first laser stick；107, the second quarter-wave plate；108, outgoing mirror；
201, focus lamp；202, SBS medium pools；203, focus lamp is reflected；
301, second laser stick；302, third laser bar；303, the second speculum；304, third speculum；305, optically-active
Crystal；306, the 4th quarter-wave plate；307, the second total reflective mirror.
Specific implementation mode
In order to make those skilled in the art more fully understand technical scheme of the present invention, below in conjunction with attached drawing to this hair
It is bright to be further detailed.
It is shown in Figure 1；
A kind of picosecond laser of the present invention, including：
Seed laser component 1, seed laser component 1 is generating and export seed laser；
Pulse Compression component 2, the output of seed laser line focus mirror 201 that seed laser component 1 exports to Pulse Compression group
Part 2, and Pulse Compression component 2 is by the Pulse Compression of seed laser；
Light path between the seed laser component 1 and Pulse Compression component 2 have the second polarizing film the 4 and the 3rd 4/
One wave plate 5, the horizontal linear polarization ray laser exported through seed laser component 1 penetrates the second polarizing film 4, through third quarter-wave
Become circular polarization light wave after piece 5, Pulse Compression component 2 has a reflection focus lamp 203, warp far from 4 one end of the second polarizing film
The laser beam that the focus lamp 201 of Pulse Compression component 2 converges reaches after the reflection focus lamp 203 in SBS medium pools 202
Portion focuses and along backtracking, the reversed Stokes laser that Pulse Compression component 2 generates is after third quarter-wave plate 5
Be formed as vertical polarization laser and reflect through the second polarizing film 4 to export；
Also there is the picosecond laser energy amplifier module 3, energy amplifier module 3 to receive swashing for the second polarizing film 4 reflection
Light, and output is amplified to the laser；
Also there is the picosecond laser energy amplifier module 3, energy amplifier module 3 to receive swashing for the second polarizing film 4 reflection
Light, and output is amplified to the laser；
Energy amplifier module 3 has two laser bars being distributed along light path, and the laser being transmitted in energy amplifier module 3
At least through light extraction after the amplification twice of one of laser bar.
Specifically, the present embodiment specifically discloses a kind of novel picosecond laser device, with seed laser component 1, pulsewidth
3 three critical pieces of compression assembly 2 and energy amplifier module.Wherein, seed laser component 1 is generated as this vibration level laser system
Seed laser, and seed laser is transmitted to Pulse Compression component 2 downstream along light path, seed laser passes through Pulse Compression component
2~6ns grades of pulse width lasers are compressed to 250~600ps grades of laser by 2 compression.Then, pass through the amplification of energy amplifier module 3
Externally output.Picosecond laser disclosed in the present embodiment by the cooperation of optical device by compressed laser in laser bar into
Row repeatedly amplification, realizes the laser that externally output energy is larger, to meet requirement.
The seed laser component is by the first total reflection mirror 101, aperture 102, Q-switch component 103, the first polarizing film
104, the first quarter-wave plate 105, first laser stick 106, the second quarter-wave plate 107 and outgoing mirror 108 form, described
Seed laser component output beam is horizontal linear polarization laser beam.
Wherein, there is expand unit between above-mentioned Pulse Compression component 2 and energy amplifier module 3；
The expand unit includes receiving to be entered by the laser polarized vertically that the first speculum 6 reflects to expand microscope group 7, is passed through
It is described expand the vertical polarization laser after microscope group 7 expands by second orifice diaphragm 8 carry out shrink beam after, by half wave plate
Become the laser of horizontal oscillations after 9, enters in energy amplifier module 3 after the laser light third polarizing film 10 of horizontal oscillations.
It is that the picosecond laser of the present invention generates seed laser and by Pulse Compression component 2 by seed laser component 1 above
Compress the process of laser to ps grades.
Embodiment one：
Shown in Figure 1, Fig. 1 shows the light path principle figure of the first embodiment of picosecond laser of the present invention；
Embodiment as the first energy amplifier module 3 of the invention：
Energy amplifier module 3 includes the second laser stick 301 for the laser for receiving 10 output of third polarizing film in the present embodiment,
Through second laser stick 301 amplify laser by the second speculum 303, third speculum 304 be transmitted to third laser bar 302 into
Row energy amplifies, and the laser that third laser bar 302 exports is transmitted to the second total reflective mirror 307 through the 4th quarter-wave plate 306, and
Second total reflective mirror 307 will be transmitted to the laser at this and be reflected along original optical path, become after again passing by the 4th quarter-wave plate 306
The laser polarized vertically passes through after carrying out energy secondary amplification after third laser bar 302 and second laser stick 301 successively later
The reflection of the third polarizing film 10 is exported to outside.
First, the present embodiment one describe it is a kind of realize two-way round trip energy amplification energy amplifier module 3 structure and
Principle.Structure and light path are specifically as above, and laser amplifies by the first time energy of second laser stick 301 first, and continues along light
Road is transmitted to third laser bar 302 and carries out second of energy amplification, and then will pass through energy twice by the second total reflective mirror 307 puts
Big laser is reflected back along original optical path, again passes by the energy amplification of third laser bar 302 and second laser stick 301, finally
Outside is reflexed to export the larger laser of energy by third polarizing film 10；And the present embodiment one is real by the cooperation of optical device
The amplification that laser passes through second laser stick 301 and third laser bar 302 twice is showed, as above-mentioned two-way round trip energy is put
Greatly, intensity laser is obtained, meets requirement, and simplify equipment, reduces use cost.
Preferably, there is in the present embodiment between second laser stick 301 and third laser bar 302 optically-active laid along light path
Crystal 305.Light path of the present embodiment between second laser stick 301 and third laser bar 302 is mounted with gyrotropi crystal 305,
Purpose is to reduce the thermal depolarization effect in amplification process.
Embodiment two：
Shown in Figure 2, Fig. 2 shows the energy amplifier modules 3 of second of embodiment of picosecond laser of the present invention
Light path principle figure；
The embodiment of second of energy amplifier module 3 as the present invention：
Energy amplifier module 3 includes the second laser stick 301 for the laser for receiving 10 output of third polarizing film in the present embodiment,
The laser amplified through second laser stick 301 is transmitted to third total reflective mirror 13 by the 5th quarter-wave plate 12, is all-trans through third
The light beam that mirror 13 reflects becomes the laser polarized vertically after again passing by the 5th quarter-wave plate, is again introduced into second laser and puts
Big stick-means of intimidation carries out energy amplification, and amplified laser is reflexed to through third polarizing film 10 on the 4th speculum 15, through the 4th speculum
The laser of 14 reflections are transmitted to third by becoming the laser of horizontal oscillations after half wave plate 9 through the 4th polarizing film 11
Energy amplification is carried out in laser bar 302；
After the amplified laser of third laser bar (302) energy is by the 6th quarter-wave plate (17), through
Four total reflective mirrors (14) reflect and become vertical polarization laser after again passing by the 6th quarter-wave plate (17), which swashs
Light is via the 4th polarizing film (11) reflection output to outside.
The embodiment second is that another structure energy amplifier module 3, realize the energy of " single channel round trip+single channel round trip "
Amplification；Specially：By instead being reflected along original optical path by third total reflective mirror 13 through 301 amplified laser of second laser stick,
The amplification of second laser stick 301 is again passed by, the energy amplification of primary " single channel round trip " is completed at this time, then, through third polarizing film
10 and the 4th speculum 15 transmission, third laser bar 302 receives amplified laser, and amplifies again to laser, and third
The laser for the light extraction end output that laser bar 302 exports is reflected back third laser bar 302 by the 4th total reflective mirror 14 along original optical path, then
Energy amplification once is carried out to laser, primary " single channel round trip " energy amplification is completed again at this time, by above-mentioned transmission, laser one
It is secondary to complete four energy amplifications, external output is finally reflexed to by the 4th polarizing film 11.
Embodiment three：
Shown in Figure 3, Fig. 3 shows the energy amplifier module 3 of the third embodiment of picosecond laser of the present invention
Light path principle figure；
Embodiment as the third energy amplifier module 3 of the invention：
Energy amplifier module 3 includes the second laser stick 301 for the laser for receiving 10 output of third polarizing film in the present embodiment,
Energy amplification is carried out through the second laser stick 301, amplified laser is transmitted to third by the 5th quarter-wave plate 12
Total reflection mirror 13, third total reflection mirror 13 will be transmitted to laser thereon and reflected along original optical path and again pass by the May 4th point
One of become vertical polarization laser after wave plate 12, carry out energy secondary amplification through second laser stick 301, amplified light beam passes through
Third polarizing film 10 reflexes to the 4th speculum 15, and the laser reflected through the 4th speculum 15 passes sequentially through half wave
Piece 9 and the 4th polarizing film 11, which are transmitted in third laser bar 302, to carry out energy amplification and exports to outside.
3 principle of energy amplifier module and embodiment two in the present embodiment is essentially identical, but the present embodiment is further simple
The structure for having changed embodiment two realizes the laser energy amplification of " single channel round trip+single channel one way ", through third laser bar 302
Primary amplified laser directly externally exports, and the laser in the embodiment have passed through energy amplification three times, can equally expire
Sufficient requirement, and further simplify structure.
Example IV：
It is shown in Figure 4,
Energy amplifier module 3 includes the second laser stick 301 for receiving the third polarizing film 10 and exporting, second laser stick
301 amplified laser enter third by the 4th speculum 15 and the 5th speculum 16 and after penetrating the 4th polarizing film 11 successively
Laser amplifier stick 302 carries out energy amplification, and amplified laser is transmitted to the 4th total reflection by the 5th quarter-wave plate 12
Mirror 14, the 4th total reflection mirror 14 will be transmitted to laser thereon and reflected along original optical path and again pass by the 5th quarter-wave plate 12
Become the laser polarized vertically afterwards, passes through the 4th polarizing film 11 reflection output to outside after third laser bar 302 is amplified.
The example IV is the energy amplifier module 3 of another structure, realizes the energy of " single channel one way+single channel round trip "
Amplification.
In the above-mentioned technical solutions, a kind of picosecond laser provided by the invention, has the advantages that：
1, the layout of reasonable arrangement compression stage and amplifying stage makes SBS medium pools not vaporize during the work time, ensures defeated
Go out energy and pulsewidth is stablized；
2, the size of output energy is controlled by being delayed between amplification system grade, ensures to export energy adjustment mistake in laser
Cheng Zhong, pulse width do not change strictly, and the thermal focal of laser is stablized.
Stimulated Brillouin scattering threshold value can be reached near focus point after light beam enters SBS medium pools, generate reversed pass
Defeated stokes light, stokes light compress laser pulse width in transmission process.
Seed laser exports the general very little of energy, and typically less than 10mJ is directly entered SBS medium pools and forms excited Brillouin
Threshold value when scattering is relatively small, and threshold value is generally less than 3mJ at this time, will not generate partial vaporization near laser spot and make defeated
Go out beam shape shakiness, the prodigious situation of pulse width variations；But seed light is by expanding and after energy amplification, excited Brillouin occurring
The threshold value of scattering is relatively high, and threshold value is easy to generate partial vaporization point, partial vaporization near focal point generally in 100mJ or more
It can go bad after the energy of Absorption of Medium laser around point and generate many micro-bubbles, medium is rotten to reduce SBS medium pools
Service life, bubble can influence light transmission, and it is prodigious that energy by Absorption of Medium makes the optical pulse energy of output and pulsewidth generate
Pulsation, the serious output stability for reducing laser.This layout is that the application is different from other based on SBS progress Pulse Compressions
Salient the most.
In carrying out energy amplification process, the pulsewidth of laser, angle of divergence polarization state etc. will not all change laser, be only energy
Increase.
In the application, the output energy and pulsewidth of seed laser are always constant, after SBS occurs, the laser of output
Energy and picosecond pulse width are also stable；When adjusting laser output energy, the output of seed laser is kept to join
Number is constant, and energy, such laser are adjusted by the discharge lag between the Implantation Energy and amplifying stage of control amplification system
The laser pulse width of output will not change with the adjusting of output energy.This control method is the important control for ensureing that pulsewidth is constant
Means.Other, generally using first energy amplification is carried out to seed light, are then carried out in laser based on SBS progress pulse compressions
Pulse is compressed, and carries out once amplifying to energy twice later again, this laser enters SBS medium pools when adjusting output energy
Incident laser parameter can change, cause when adjusting laser energy, the laser pulse width of output is also variation.This is being cured
It treats and abstains from the most in laser, because in clinic, doctor can be used as the dosage of laser using energy density size, but actually
In, when laser interacts with skin, the power density of laser is only most direct and significant physical quantity.Adjusting energy
When, the pulsewidth of only laser is constant, and energy density just has Clinical significance of MG.For example, to treat size different by doctor
Freckle, doctor, which only needs directly to have by hand, changes laser facula size, and complete machine can automatically adjust energy to ensure energy density
It is constant.If the pulsewidth of laser is constant, power density is constant before and after adjusting, and function and effect are identical；If this process pulsewidth becomes smaller,
Although adjusting, front and back energy density does not become but power density becomes larger, and function and effect can aggravate.The good of energy is adjusted by being delayed
It is in can accurately control output energy, and the angle of divergence of laser will not change when changing energy or frequency.
As stated above, the topology layout of the picosecond laser of invention is (after the seed laser of a few mJ outputs energy is introduced into SBS
Into amplifying stage) in open source information at home and abroad beyond example.
Above certain exemplary embodiments that the present invention is only described by way of explanation, undoubtedly, for ability
The those of ordinary skill in domain without departing from the spirit and scope of the present invention can be with a variety of different modes to institute
The embodiment of description is modified.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as to the present invention
The limitation of claims.
Claims (8)
1. a kind of picosecond laser, which is characterized in that including：
Seed laser component (1), the seed laser component (1) is generating and export seed laser；
The seed laser line focus mirror (201) of Pulse Compression component (2), seed laser component (1) output is exported to described
Pulse Compression component (2), and the Pulse Compression component (2) is by the Pulse Compression of seed laser；
Light path between the seed laser component (1) and Pulse Compression component (2) has the second polarizing film (4) and the three or four point
One of wave plate (5), the horizontal linear polarization ray laser through the seed laser component (1) output is through the second polarizing film (4) and passing through
Become circular polarization light wave after third quarter-wave plate (5), the Pulse Compression component (2) is far from second polarizing film (4) one
End has a reflection focus lamp (203), and the laser beam of focus lamp (201) convergence through the Pulse Compression component (2) reaches
In SBS medium pools (202) internal focus and along backtracking, the Pulse Compression component (2) after the reflection focus lamp (203)
The reversed Stokes laser generated is formed as vertical polarization laser after the third quarter-wave plate (5) and through the
Two polarizing films (4) reflection output；
Also there is the picosecond laser energy amplifier module (3), the energy amplifier module (3) to receive second polarizing film
(4) laser reflected, and output is amplified to the laser；
The energy amplifier module (3) has two laser bars being distributed along light path, and is transmitted to the energy amplifier module (3)
Interior laser is at least through light extraction after the amplification twice of laser bar described in one of them.
2. a kind of picosecond laser according to claim 1, which is characterized in that the seed laser component (1) is by first
Total reflection mirror (101), aperture (102), Q-switch component (103), the first polarizing film (104), the first quarter-wave plate
(105), first laser stick (106), the second quarter-wave plate (107) and outgoing mirror (108) composition, the seed laser component
(1) output beam is horizontal linear polarization laser beam.
3. a kind of picosecond laser according to claim 1, which is characterized in that the Pulse Compression component (2) and described
There is expand unit between energy amplifier module (3)；
The expand unit includes receiving the vertical polarization laser reflected by the first speculum (6) and entering beam expanding lens group (7), warp
It is described expand the vertical polarization laser after microscope group (7) expands by second orifice diaphragm (8) carry out shrink beam after, by half
Become horizontal oscillations laser after wave plate (9), the horizontal oscillations laser light third polarizing film (10) enters energy amplification group afterwards
Part (3).
4. a kind of picosecond laser according to claim 3, which is characterized in that the energy amplifier module (3) includes connecing
The second laser stick (301) for receiving the laser of third polarizing film (10) output, through swashing for the second laser stick (301) amplification
Light is transmitted to third laser bar (302) by the second speculum (303), third speculum (304) and carries out energy amplification, and described the
The laser of three laser bars (302) output is transmitted to the second total reflective mirror (307) through the 4th quarter-wave plate (306), and described the
Two total reflective mirrors (307) will be transmitted to the laser at this and be reflected along original optical path, again pass by the 4th quarter-wave plate (306) and become afterwards
For vertical polarization laser, which passes through third laser bar (302) and second laser stick (301) to carry out successively
The reflection through the third polarizing film (10) is exported to outside after energy secondary amplification.
5. a kind of picosecond laser according to claim 4, which is characterized in that the second laser stick (301) and third
There is the gyrotropi crystal (305) laid along light path between laser bar (302).
6. a kind of picosecond laser according to claim 3, which is characterized in that the energy amplifier module (3) includes connecing
The second laser stick (301) for receiving the laser of third polarizing film (10) output, through swashing for the second laser stick (301) amplification
Light is transmitted to third total reflective mirror (13) by the 5th quarter-wave plate (12), and third total reflective mirror (13) will be transmitted to swashing thereon
Light reflects along original optical path and becomes vertical polarization laser after again passing by the 5th quarter-wave plate (12), swashs by second
Optical wand (301) carries out second energy amplification, and amplified laser reflexes to the 4th speculum (15) by third polarizing film (10),
The laser reflected through the 4th speculum (15) passes sequentially through half wave plate (9) and the 4th polarizing film (11) is transmitted to the
Energy amplification is carried out in three laser bars (302)；
It is complete through the 4th after the amplified laser of third laser bar (302) energy is by the 6th quarter-wave plate (17)
Anti- mirror (14) reflects and becomes vertical polarization laser after again passing by the 6th quarter-wave plate (17), the vertical polarization laser warp
By the 4th polarizing film (11) reflection output to outside.
7. a kind of picosecond laser according to claim 3, which is characterized in that the energy amplifier module (3) includes connecing
The second laser stick (301) for receiving the laser of third polarizing film (10) output, energy is carried out through the second laser stick (301)
Amplification, amplified laser are transmitted to third total reflection mirror (13), third total reflection mirror by the 5th quarter-wave plate (12)
(13) laser thereon is will be transmitted to reflect along original optical path and become perpendicular after again passing by the 5th quarter-wave plate (12)
Straight polarization laser carries out energy secondary amplification through second laser stick (301), and amplified light beam is anti-by third polarizing film (10)
It is incident upon the 4th speculum (15), the laser reflected through the 4th speculum (15) passes sequentially through half wave plate (9) and the
Four polarizing films (11), which are transmitted in third laser bar (302), to carry out energy amplification and exports to outside.
8. a kind of picosecond laser according to claim 3, which is characterized in that the energy amplifier module (3) includes connecing
The second laser stick (301) of third polarizing film (10) output is received, the amplified laser of the second laser stick (301) is successively
Enter third laser amplifier stick by the 4th speculum (15) and the 5th speculum (16) and after penetrating the 4th polarizing film (11)
(302) energy amplification is carried out, amplified laser is transmitted to the 4th total reflection mirror (14) by the 5th quarter-wave plate (12),
4th total reflection mirror (14) will be transmitted to laser thereon and be reflected along original optical path and again pass by the 5th quarter-wave plate (12)
Become the laser polarized vertically afterwards, it is defeated by the 4th polarizing film (11) reflection after third laser bar (302) is amplified
Go out to outside.
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| CN108666854B (en) | 2024-01-30 |
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