CN205720917U - A kind of scattered spot laser instrument relevant based on low time coherence and low spatial - Google Patents
A kind of scattered spot laser instrument relevant based on low time coherence and low spatial Download PDFInfo
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- CN205720917U CN205720917U CN201620310175.7U CN201620310175U CN205720917U CN 205720917 U CN205720917 U CN 205720917U CN 201620310175 U CN201620310175 U CN 201620310175U CN 205720917 U CN205720917 U CN 205720917U
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Abstract
The utility model discloses a kind of scattered spot laser instrument relevant based on low time coherence and low spatial, and this scattered spot laser instrument includes radio-frequency modulator, laser instrument, diffraction optical element and the condenser lens coaxially setting gradually on same optical table；Diffraction optical element is positioned on the direction of described laser emitting, and laser instrument is modulated by radio-frequency modulator, and the laser light incident through radio-frequency modulator modulation enters diffraction optical element；Laser beam via diffraction optical element outgoing is zero to be concerned with speckle laser beam, and laser beam enters to inject condenser lens, and the laser of line focus lens outgoing forms the scattered spot laser of focusing.The utility model proposes a kind of scattered spot laser instrument based on low temporal coherence and low spatial coherence, reduce temporal coherence by a kind of and the technology of spatial coherence has obtained a kind of scattered spot laser output beam, the problem solving the speckle producing because of temporal coherence and spatial coherence.
Description
Technical field
The utility model relates to field of laser device technology, is specifically related to a kind of relevant less than low time coherence and low spatial
Scattered spot laser instrument.
Background technology
The features such as high brightness, high coherence and high collimation that laser has due to it, at industry, communication, medical treatment, laser
Detection has a wide range of applications with the aspect such as measurement, instrument and meter.Laser has high coherence and amplitude differs mutually with position
Light beam, form graininess the speckle------laser speckle of random distribution at spatial points.Laser speckle as one with
Machine process, is the objective physical phenomenon using with laser instrument and certainly existing.Laser speckle not only causes energy loss, with
When also become restriction picture quality, reduce the principal element of image resolution ratio and contrast, such as swashing in research and application at present
Light Projection Display and field of laser illumination, laser speckle becomes restriction laser display and realizes really practical key.
Varied with regard to the method eliminating laser speckle at present, two classes can be divided in general: the first is static to dissipate
Spot method；As reduced laser chamber length or restrainting to closing again after incident beam beam splitting in the optical path, reduce the coherence of incident beam, but
The method operation complexity, light path connective stability is low.CN102122081A disclosed " laser-beam uniform-light light shaping and dissipation spot dress
Put " use by pure phase diffractive device electromagnetic oscillation device driving under complete even light shaping and dissipation spot function；
CN101950087A disclosed " a kind of method eliminating laser speckle effect " is by the liquid of the led to light by vibration for the incident beam
Beam phase is carried out destroying and eliminates laser speckle effect by body.
It two is dynamic speckle method.Enter Mobile state process to laser speckle, utilize the time averagely to suppress speckle, as rotate or
Vibrational scattering body (frosted glass, liquid-crystal apparatus, phase-plate), supercritical ultrasonics technology etc..When using dynamic speckle method, speckle variations frequency is got over
Hurry up, between speckle, correlation is less, better in time averagely rear speckle inhibition, but takes the knot of dynamic speckle method at present
Structure is complicated, and the stability of system is bad.During current speckle eliminates, speckle refrequency control range is limited, and the phase adjusted degree of depth is little to be made
Obtaining speckle correlation relatively big, factors above reduces speckle inhibition, and incident beam passes through liquid-crystal apparatus and frosted glass simultaneously
Capacity usage ratio is relatively low, and energy loss is big, and along with angular expanse phenomenon, have impact on the performance of system.
In sum, either static ecchymose removing method or dynamically ecchymose removing method, be all itself to go out from laser instrument (or laser)
Send reduce the performance on system for the laser speckle impact, during both approaches be only reduce laser speckle to system
The impact of performance, but can not cut down (or compensation) easily thus obtain one from further Real-Time Evaluation and measurement system
Plant the impact of low speckle, the view data of high s/n ratio.
Content of the invention
The purpose of this utility model is contemplated to solve the above-mentioned problems in the prior art, it is proposed that a kind of based on low
The scattered spot laser instrument that time coherence and low spatial are concerned with, reduces time phase by one
The technology of dryness and spatial coherence has obtained the light beam of a kind of scattered spot laser output.
The purpose of this utility model is achieved through the following technical solutions: a kind of relevant based on low time coherence and low spatial
Scattered spot laser instrument, including coaxially set gradually on same optical table for reducing laser beam temporal coherence
Radio-frequency modulator, laser instrument, for reducing diffraction optical element and the condenser lens of laser beam space coherence；Described diffraction
Optical element is positioned on the direction of described laser emitting, and described laser instrument is modulated by described radio-frequency modulator, Jing Guosuo
The laser light incident stating radio-frequency modulator modulation enters described diffraction optical element；Laser light via described diffraction optical element outgoing
Bundle is for being concerned with speckle laser beam based on the zero of low temporal coherence and low spatial coherence, and described laser beam enters to inject described
Condenser lens, forms the scattered spot laser of focusing through the laser of described condenser lens outgoing.
Preferably, under the modulating action of described radio-frequency modulator, the Laser Time of the outgoing of described laser instrument own is concerned with
Length shortens, and forms the laser of low time attribute.
Preferably, the laser of described low time coherence attribute is through diffraction optical element, and the wave surface of laser carries out weight
Newly constructed, the phase bit position of the single part of the wave surface of the laser rebuilding creates skew.
Preferably, the coherence length of the laser of described phase pushing figure and low time coherence attribute is mated, and reaches
Matching relationship for exactly relative to swashing to the laser part of neighbouring low time coherence attribute or low time coherence attribute
Light self, can form the position relationship of the condition of low time coherence, thus has reached a kind of based on low temporal coherence with low
The relevant laser output dissipating class of the zero of spatial coherence.
Preferably, described zero laser emitting being concerned with speckle based on low temporal coherence and low spatial coherence passes through poly-
Focus lens part, the outgoing wave front of laser instrument is reconstructed again, makes this kind of base under outgoing wave front reconstruct effect
Reach the purpose focusing in zero laser emitting being concerned with speckle of low temporal coherence and low spatial coherence, obtain focusing
Be concerned with the laser of speckle based on the zero of low temporal coherence and low spatial coherence.
Preferably, the material of described diffraction optical element can be vitreous silica, optical glass or optical resin material.
Preferably, described diffraction optical element is by molding or etching technics is made.
The advantage of technical solutions of the utility model is mainly reflected in: the utility model proposes a kind of based on low time coherence
Property and the scattered spot laser instrument of low spatial coherence, reduce temporal coherence and the technology of spatial coherence obtains by a kind of
The light beam of a kind of scattered spot laser output, relative to current technology scheme, solves because of temporal coherence and spatial coherence
And the problem of the speckle producing, thus obtain the laser instrument of scattered spot laser output.
Brief description
Fig. 1 is the structure of a kind of scattered spot laser instrument relevant based on low time coherence and low spatial of the present utility model
Schematic diagram；
Fig. 2 be a kind of scattered spot laser instrument relevant based on low time coherence and low spatial of the present utility model have laser
The contrast schematic diagram of speckle and scattered spot.
Detailed description of the invention
The purpose of this utility model, advantage and feature, will carry out figure by the non-limitative illustration of preferred embodiment below
Show and explain.These embodiments only be application technical solutions of the utility model prominent example, all take equivalent or etc.
Effect conversion and the technical scheme that formed, all fall within the utility model within the scope of claim.
As shown in Figure 1.A kind of scattered spot laser instrument relevant based on low time coherence and low spatial, including at same optics
Radio-frequency modulator the 1st, the laser instrument for reducing laser beam temporal coherence coaxially setting gradually on platform is the 2nd, for reducing
The diffraction optical element 3 of laser beam space coherence and condenser lens 4.In the present embodiment, described laser instrument 2 is preferably one
Semiconductor laser, the advantage of selection semiconductor laser is: the wave-length coverage width of semiconductor laser, makes simple, cost
Low, laser utilization ratio height is easy to produce in a large number, and volume is little, lightweight, length in service life, cost performance are high and power-saving.
Described diffraction optical element 3 is positioned on the direction of described laser instrument 2 outgoing, the material of described diffraction optical element 3
Can be vitreous silica, optical glass or optical resin material, in the present embodiment, the material of described diffraction optical element 3 is preferred
For optical resin material.Optical resin material why is selected to be because that optical resin has the advantage that optical resin not only
Transparent light transmission is good, and at visible region, the light transmittance of optical resin is similar with glass, in infrared light district, and the printing opacity of optical resin
Rate is more slightly higher than glass, in ultra-violet (UV) band, starts to reduce with the reduction light transmittance of wavelength with 0.4 micron, the light less than 0.3 micron for the wavelength
Almost all absorbs；Strong shock resistance, the impulsive force of optical resin is several times of glass, not broken, safety durable.When
So in the course of the work, it is possible to select optical glass, when when selecting optical glass, preferably SCHOTT Schott AG of Germany is raw
The BK7 glass producing, is equivalent to domestic K9 glass, and the design parameter of BK7 glass is as follows: refractive index 1.51680, acid resistance 1, K
Family name's hardness 610.
Described diffraction optical element 3 is made up of mold pressing or etching technics, and described diffraction optical element 3 is applicable to Nd:
The various laser instruments such as YAG, CO2, femto-second laser, semiconductor laser carry out beam shaping, the master of described diffraction optical element 3
Apply include laser beam shaping (such as Laser Processing, medical treatment, imaging system, sensor, circular or square flat top beam is whole
Shape, matrix, grid, linear, circular pattern shaping) and as the phase place device in astronomy.
When described radio-frequency modulator 1 and described laser instrument 2 are operated, described radio-frequency modulator 1 is to described laser instrument 2
It is modulated, under the modulating action of described radio-frequency modulator 1, the Laser Time coherence length of the outgoing of described laser instrument 2 own
Shorten, i.e. Laser Time coherence length shortens, and the laser coherence time shortens and forms the laser 001 of low time attribute.
Laser 001 through the modulation of described radio-frequency modulator 1 enters to inject described diffraction optical element 3；Via described diffraction
The laser beam of optical element 3 outgoing is for being concerned with speckle laser beam based on the zero of low temporal coherence and low spatial coherence
002, the wave surface of laser, through diffraction optical element 3, is rebuild, again by the laser of described low time coherence attribute
The phase bit position of the single part of the laser wave front building creates skew.
The function of described diffraction optical element 3 is to rebuild the wave surface of laser, the laser building further
Wave surface single part phase bit position produce skew, the relevant length of the laser of phase pushing figure and low time coherence attribute
Degree is mated, and the matching relationship reached is for exactly relative to the laser part of neighbouring low time coherence attribute or low
The laser of time coherence attribute self, can form the position relationship of the condition of low time coherence.
Laser beam via the spatial coherence of described diffraction optical element 3 reduction enters to inject described condenser lens 4, warp
The laser of described condenser lens 4 outgoing forms the scattered spot laser 003 of focusing；Described phase pushing figure and low time coherence belong to
Property the coherence length of laser mated, the matching relationship reached is for exactly belonging to relative to neighbouring low time coherence
The laser part of property or the laser self of low time coherence attribute, can form the position relationship of the condition of low time coherence,
Thus reached a kind of zero relevant laser output dissipating class based on low temporal coherence and low spatial coherence.
It described is concerned with the laser emitting of speckle through condenser lens based on the zero of low temporal coherence and low spatial coherence
Part, the outgoing wave front of laser instrument is reconstructed again, makes this kind based on when low under outgoing wave front reconstruct effect
Between zero laser emitting being concerned with speckle of coherence and low spatial coherence reach the purpose that focuses on, mating follow-up reality should
With ultimately forming the laser of the speckle that is concerned with based on the zero of low temporal coherence and low spatial coherence of focusing.Such as Fig. 2 institute
Show, Fig. 2 be a kind of scattered spot laser instrument relevant based on low time coherence and low spatial have the right of laser speckle and scattered spot
Than schematic diagram more as seen from Figure 2, through the schematic diagram of the laser instrument before elimination laser speckle, it can be seen that
Laser speckle is the graininess speckle of random distribution；Laser instrument through RF modulation reduces temporal coherence, after RF modulation
Laser beam enter to inject diffraction optical element after reduce spatial coherence, through diffraction optical element reduce spatial coherence
Laser light incident enter condenser lens, as shown in Figure 2, obtain focusing based on the zero of low temporal coherence and low spatial coherence
The laser beam of relevant speckle；The above-mentioned concrete embodiment for low spatial coherence and low temporal coherence, can obtain scattered spot
Or the output of low speckle.
In each wave surface, partially coherent ripple is spatial coherence, and partially coherent is at axial direction；Compound phase mass dryness fraction g
(r1, r2) depends on time delay, and temporal coherence and the spatial coherence of light have position characteristic.Time coherence characteristic is by g
(r1, r2,0) describes, and the axial distance that fluctuation separates at two points is about incoherent more than coherence length.Propagate from light
Ripple and complicated wave function must are fulfilled for wave equation, and the time of light and space wave are closely related.For quasi-monochromatic light
Compound phase mass dryness fraction g (r1, r2,0) of ripple is represented by g (r1, r2), and DOE (diffraction optical element) can make coherent area movement be less than light
The resolution ratio of system, the compound phase mass dryness fraction of relevant g (r1, r2) can be considered the i.e. all r1 of infinitesimal and be not equal to r2.
In the case of the limit, g (r1, r2)=0 is just incoherent, by the backscattered coherent interference of light from enough unrestrained
The space structure of the laser speckle pattern that reflecting surface produces.Space beyond low spatial coherent illumination stage conjugate time reverse ripple
Coherent area movement, this Low coherence semiconductor laser can obtain scattered spot or low speckle plus DOE (diffraction optical element).
Semiconductor laser is modulated at High Data Rate, and it is due to transient state Spectral Phenomenon, different modulation that laser spectrum expands
Index produce there is the different modulating degree of depth widen spectrum.This semiconductor laser has stable wide wave band and not mode hopping,
This semiconductor laser can produce low temporal coherence.If we define ρcIt is coherence distance, then coherent area is ρc, then
ρc=1.22 λ/θs.θ heres=2a/d is the angle corresponding to light source, and a is the radius of a Circular Aperture, and d is from light source to sight
Examine the distance of wave surface.Give an example, wavelength X=0.5 μm of a light source and θs=0.5o, then their coherence length ρc=
115 λ=57.5 μm.
The utility model compact conformation, can obtain zero and be concerned with speckle laser, in actual application, substantially increase
The efficiency of light energy utilization, has that volume is little, a low cost and the advantage such as can be mass.
The utility model proposes a kind of scattered spot laser instrument relevant based on low time coherence and low spatial, pass through simultaneously
A kind of technology reducing temporal coherence and spatial coherence has obtained the light beam of a kind of scattered spot laser output, relative to existing
Technical scheme in technology, solves the speckle issue producing because of temporal coherence and spatial coherence, thus has obtained zero
The laser instrument of speckle laser output.
The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, every
Utilize the equivalent structure that the utility model specification and accompanying drawing content made or equivalence flow process conversion, or be directly or indirectly used in
Other related technical fields, all in like manner include in scope of patent protection of the present utility model.
Claims (6)
1. the scattered spot laser instrument being concerned with based on low time coherence and low spatial, it is characterised in that: include at same optics
Coaxially set gradually on platform for reducing radio-frequency modulator (1), the laser instrument (2) of laser beam temporal coherence, being used for
Reduce diffraction optical element (3) and the condenser lens (4) of laser beam space coherence；Described diffraction optical element (3) is positioned at
On the direction of described laser instrument (2) outgoing, described laser instrument (2) is modulated by described radio-frequency modulator (1), penetrates through described
The laser light incident that converting modulator (1) is modulated enters described diffraction optical element (3)；Via described diffraction optical element (3) outgoing
Laser beam is for being concerned with speckle laser beam based on the zero of low temporal coherence and low spatial coherence, and described laser beam is incident
Enter described condenser lens (4), form the scattered spot laser of focusing through the laser of described condenser lens (4) outgoing.
2. a kind of scattered spot laser instrument relevant based on low time coherence and low spatial according to claim 1, its feature
It is: under the modulating action of described radio-frequency modulator (1), the Laser Time coherence length of the outgoing of described laser instrument (2) own
Shorten, form the laser of low time attribute.
3. a kind of scattered spot laser instrument relevant based on low time coherence and low spatial according to claim 2, its feature
It is: the wave surface of laser, through diffraction optical element (3), is rebuild by the laser of described low time coherence attribute,
The phase bit position of the single part of the laser wave front rebuilding creates skew.
4. a kind of scattered spot laser instrument relevant based on low time coherence and low spatial according to claim 1, its feature
It is: the material of described diffraction optical element (3) can be vitreous silica, optical glass or optical resin material.
5. a kind of scattered spot laser instrument relevant based on low time coherence and low spatial according to claim 1, its feature
It is: described diffraction optical element (3) is made up of mold pressing or etching technics.
6. a kind of scattered spot laser instrument relevant based on low time coherence and low spatial according to claim 1, its feature
It is: described laser instrument (2) is semiconductor laser.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620310175.7U CN205720917U (en) | 2016-04-14 | 2016-04-14 | A kind of scattered spot laser instrument relevant based on low time coherence and low spatial |
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| CN201620310175.7U CN205720917U (en) | 2016-04-14 | 2016-04-14 | A kind of scattered spot laser instrument relevant based on low time coherence and low spatial |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717661A (en) * | 2016-04-14 | 2016-06-29 | 维林光电(苏州)有限公司 | Speckle laser device based on low time coherence and low spatial coherence and preparation method thereof |
| CN109254415A (en) * | 2018-10-31 | 2019-01-22 | 四川长虹电器股份有限公司 | The laser of engraving external diffusion disappears speckle device in a kind of multidimensional |
| CN109557680A (en) * | 2019-01-04 | 2019-04-02 | 浙江工业大学 | A kind of static laser speckle inhibition system of combination multimode lightguide and diffraction optical device |
-
2016
- 2016-04-14 CN CN201620310175.7U patent/CN205720917U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717661A (en) * | 2016-04-14 | 2016-06-29 | 维林光电(苏州)有限公司 | Speckle laser device based on low time coherence and low spatial coherence and preparation method thereof |
| WO2017177937A1 (en) * | 2016-04-14 | 2017-10-19 | 维林光电(苏州)有限公司 | Speckle laser device based on low time coherence and low spatial coherence, and preparation method therefor |
| CN105717661B (en) * | 2016-04-14 | 2018-06-26 | 维林光电(苏州)有限公司 | A kind of scattered spot laser being concerned with based on low time coherence and low spatial and preparation method thereof |
| CN109254415A (en) * | 2018-10-31 | 2019-01-22 | 四川长虹电器股份有限公司 | The laser of engraving external diffusion disappears speckle device in a kind of multidimensional |
| CN109557680A (en) * | 2019-01-04 | 2019-04-02 | 浙江工业大学 | A kind of static laser speckle inhibition system of combination multimode lightguide and diffraction optical device |
| CN109557680B (en) * | 2019-01-04 | 2024-04-16 | 浙江工业大学 | Static laser speckle suppression system incorporating multimode optical waveguide and diffractive optics |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161123 Effective date of abandoning: 20180626 |
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| AV01 | Patent right actively abandoned |