CN104538827A - Light beam purification method and solid laser device based on digital holography technology - Google Patents
Light beam purification method and solid laser device based on digital holography technology Download PDFInfo
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- CN104538827A CN104538827A CN201410776555.5A CN201410776555A CN104538827A CN 104538827 A CN104538827 A CN 104538827A CN 201410776555 A CN201410776555 A CN 201410776555A CN 104538827 A CN104538827 A CN 104538827A
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Abstract
The invention provides a light beam purification method and solid laser device based on the digital holography technology. The solid laser device comprises a first polarization beam splitter prism, a plurality of laser amplifier stages, a second polarization beam splitter prism, a CCD and a spatial light modulator, wherein the first polarization beam splitter prism reflects a beacon beam and outputs reflected light of the beacon beam, the laser amplifier stages amplify the reflected light of the beacon beam with phase distortion information and output the amplified beam with the phase distortion information, the second polarization beam splitter prism is used for reflecting the amplified beam with the phase distortion information and outputting the reflected beam, the CCD is used for projecting the reflected beam and reference light and conducting interference on the reflected beam and the reference light so as to obtain a digital holographic image, the spatial light modulator outputs local oscillator light with the conjugation phase distribution characteristic according to the digital holographic image under the irradiation of emergent light, the second polarization beam splitter prism is used for conducting transmission on the local oscillator light with the conjugation phase distribution characteristic, the laser amplifier stages are used for amplifying the local conjugation light where transmission is conducted through the second polarization beam splitter prism and outputting the amplified light, and the first polarization beam splitter prism is used for conducting transmission on the amplified light and then outputting the amplified light. Phase control does not need to be conducted on the intense laser wavefront, thermal distortion and thermal damage of optical elements are avoided, and the light beam purification method and the solid laser device are suitable for being applied to high-power solid laser devices.
Description
Technical field
The present invention, about field of laser device technology, particularly about the beam cleanup technology of solid state laser, is a kind of beam cleanup method based on Digital Holography and solid state laser concretely.
Background technology
In recent years, solid-state light laser technology achieves important breakthrough, the many advantages such as it has compact conformation, compact, driven by power, pollution-free, with low cost, sequential filming ability is strong, and application demand is widely had in fields such as industrial processes, national defense and military and scientific researches.
Current, the power level of the high light beam quality solid state laser of single gain host is thousands of watts of magnitudes, even if adopt main oscillations-power amplification structure technology, the Solid State Laser link average power that the nearly diffraction limit in single port footpath exports also can only reach tens of kilowatt magnitude.
Hartmann's wavefront sensing-distorting lens wavefront correction is alignment technique before the laser wave of maturation, and measured the phase distortion of laser emitting wavefront by real-time continuous, the distorting lens as wave-front corrector provides control signal, and then improves Emission Lasers beam quality.
But alignment technique all uses distorting lens, tilting mirror etc. before laser wave of the prior art, because the pixel of distorting lens, tilting mirror is comparatively large, resolution is low, and fill factor, curve factor is low, poor to the calibration result of higher order wave front-distortion.
Summary of the invention
In order to alignment technique before solving laser wave of the prior art all uses distorting lens, tilting mirror etc., due to distorting lens, the pixel of tilting mirror is larger, resolution is low, fill factor, curve factor is low, a difficult problem poor to the calibration result of higher order wave front-distortion, the invention provides a kind of beam cleanup method based on Digital Holography and solid state laser, utilize polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
An object of the present invention is, provide a kind of beam cleanup solid state laser based on Digital Holography, described solid state laser comprises: the first polarization beam splitter prism, for reflecting a beacon beam, exports the reverberation of described beacon beam; Multiple laser amplifier level, for amplifying the reverberation of described beacon beam, exports the amplification light with phase distortion information; Second polarization beam splitter prism, for reflecting the amplification light with phase distortion information, output reflection light; CCD image sensor, for projecting described reverberation and a reference light, and interfering described reverberation and reference light, obtaining digital hologram; Described spatial light modulator, for exporting the local oscillator light with conjugate phase distribution character according to described digital hologram under the irradiation of an emergent light; Second polarization beam splitter prism, for carrying out transmission to the described local oscillator light with conjugate phase distribution character; Multiple laser amplifier level, for amplifying the local oscillator light after described second polarization beam splitter prism transmission, exporting and amplifying light; First polarization beam splitter prism, exports after carrying out transmission to amplification light.
Preferably, described solid state laser also comprises: 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.
Preferably, described coupler is fiber coupler.
Preferably, the polarization direction of described beacon beam and reference light is perpendicular to paper.
Preferably, described solid state laser also comprises: main oscillations laser, for exporting an emergent light.
Preferably, the polarization direction of described emergent light is parallel to paper.
Preferably, if the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.
Preferably, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6.
Preferably, described solid state laser also comprises: controller, for obtaining described digital hologram, and described digital hologram is sent to spatial light modulator.
An object of the present invention is, provide a kind of beam cleanup method based on Digital Holography, described method comprises: the first polarization beam splitter prism reflects a beacon beam, exports the reverberation of described beacon beam; The reverberation of multiple laser amplifier levels to described beacon beam amplifies, and exports the amplification light with phase distortion information; Second polarization beam splitter prism reflects the amplification light with phase distortion information, output reflection light; CCD image sensor projects described reverberation and a reference light, and interferes described reverberation and reference light, obtains digital hologram; Spatial light modulator exports the local oscillator light with conjugate phase distribution character according to described digital hologram under the irradiation of an emergent light; Second polarization beam splitter prism carries out transmission to the described local oscillator light with conjugate phase distribution character; Multiple laser amplifier level is amplified the local oscillator light after described second polarization beam splitter prism transmission, exports and amplifies light; First polarization beam splitter prism carries out transmission to amplification light, the light beam after output beam purification.
Preferably, described method also comprises: laser output laser beam; Described laser beam light splitting is a beacon beam and a reference light by coupler.
Preferably, described coupler is fiber coupler.
Preferably, the polarization direction of described beacon beam and reference light is perpendicular to paper.
Preferably, described method also comprises: main oscillations laser exports an emergent light.
Preferably, the polarization direction of described emergent light is parallel to paper.
Preferably, if the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.
Preferably, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6.
Preferably, described method also comprises: the digital hologram described in controller obtains, and described digital hologram is sent to spatial light modulator.
Beneficial effect of the present invention is, provide a kind of beam cleanup method based on Digital Holography and solid state laser, utilize polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, the conjugation playback light obtained by main oscillations laser illumination enters amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.Adopt the digital hologram method of " digital record-optical reproduction ", improve digital hologram recording and reconstruction speed, be applicable to adaptive optics application.Carry out digital hologram collection with CCD, have feature that is quick, real-time, full filed, gather wave front data with traditional Hartmann wave front sensor and compare, resolution improves greatly, thus can go out higher order wave front-distortion by accurately detecting.
For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the execution mode one of a kind of beam cleanup method based on Digital Holography that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the execution mode two of a kind of beam cleanup method based on Digital Holography that Fig. 2 provides for the embodiment of the present invention;
The flow chart of the execution mode three of a kind of beam cleanup method based on Digital Holography that Fig. 3 provides for the embodiment of the present invention;
The flow chart of the execution mode four of a kind of beam cleanup method based on Digital Holography that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the execution mode one of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the execution mode one of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the execution mode one of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 7 provides for the embodiment of the present invention;
The structural representation of the execution mode one of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 8 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Before the present invention is directed to laser wave of the prior art, alignment technique all uses distorting lens, tilting mirror etc., due to distorting lens, the pixel of tilting mirror is larger, resolution is low, fill factor, curve factor is low, a difficult problem poor to the calibration result of higher order wave front-distortion, provide a kind of beam cleanup method based on Digital Holography and solid state laser, utilize polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The structured flowchart of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 5 provides for the embodiment of the present invention, as shown in Figure 5, in execution mode one, described solid state laser comprises:
First polarization beam splitter prism 100, for a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
Multiple laser amplifier level 200, for the reverberation R to described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information
4reflect, output reflection light R
5;
CCD image sensor 400, for projecting described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.
Spatial light modulator 500, at an emergent light R
7irradiation under export with the local oscillator light R of conjugate phase distribution character according to described digital hologram
8;
Second polarization beam splitter prism 300, for the described local oscillator light R with conjugate phase distribution character
8carry out transmission;
Multiple laser amplifier level 200, for the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export and amplify light R
10;
First polarization beam splitter prism 100, for amplification light R
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of solid state laser based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The structured flowchart of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 6 provides for the embodiment of the present invention, as shown in Figure 6, in execution mode two, described solid state laser comprises:
Laser 600, for outgoing laser beam R
1;
Coupler 700, is connected with described laser 600, for by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
Multiple laser amplifier level 200, for the reverberation R to described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information
4reflect, output reflection light R
5;
CCD image sensor 400, for projecting described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
Spatial light modulator 500, at an emergent light R
7irradiation under export local oscillator light R according to described digital hologram
8;
Second polarization beam splitter prism 300, for described local oscillator light R
8carry out transmission;
Multiple laser amplifier level 200, for the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10;
First polarization beam splitter prism 100, for the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of solid state laser based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The structured flowchart of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 7 provides for the embodiment of the present invention, as shown in Figure 7, in execution mode three, described solid state laser comprises:
Laser 600, for outgoing laser beam R
1;
Coupler 700, is connected with described laser 600, for by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
Multiple laser amplifier level 200, for the reverberation R to described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information
4reflect, output reflection light R
5;
CCD image sensor 400, for projecting described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
Main oscillations laser 800, for exporting an emergent light R
7.The polarization direction of described emergent light is parallel to paper.
Spatial light modulator 500, at an emergent light R
7irradiation under export local oscillator light R according to described digital hologram
8;
Second polarization beam splitter prism 300, for described local oscillator light R
8carry out transmission;
Multiple laser amplifier level 200, for the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10;
First polarization beam splitter prism 100, for the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of solid state laser based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The structured flowchart of a kind of beam cleanup solid state laser based on Digital Holography that Fig. 8 provides for the embodiment of the present invention, as shown in Figure 8, in execution mode four, described solid state laser comprises:
Laser 600, for outgoing laser beam R
1;
Coupler 700, is connected with described laser 600, for by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
First polarization beam splitter prism 100, for a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
Multiple laser amplifier level 200, for the reverberation R to described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
Second polarization beam splitter prism 300, for the amplification light R with phase distortion information
4reflect, output reflection light R
5;
CCD image sensor 400, for projecting described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
Controller 900, for obtaining described digital hologram, and is sent to spatial light modulator by described digital hologram.
Main oscillations laser 800, for exporting an emergent light R
7.The polarization direction of described emergent light is parallel to paper.
Spatial light modulator 500, at an emergent light R
7irradiation under export local oscillator light R according to described digital hologram
8;
Second polarization beam splitter prism 300, for described local oscillator light R
8carry out transmission;
Multiple laser amplifier level 200, for the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10;
First polarization beam splitter prism 100, for the amplification light R with conjugation item PHASE DISTRIBUTION characteristic
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
Digital hologram is loaded in spatial light modulator, with main oscillations laser emitting light R
7(polarization direction is parallel to paper, transmission on polarization beam splitter prism) throw light on reconstructing hologram, the conjugation item PHASE DISTRIBUTION utilizing its reproducing is the characteristic of-Ф, as in local oscillator light from right to left injection amplification level, after amplifying step by step, obtains high-quality Laser output.If the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.In a particular embodiment, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6
Beacon beam input power is enough little of to ensure that not affecting laser amplifier level normally works in this scenario.
As mentioned above, be a kind of solid state laser based on Digital Holography provided by the invention, (polarization direction is perpendicular to paper for beacon beam, polarization beam splitter prism reflects) be divided into two-way, wherein beacon beam is carried phase distortion information Ф in laser amplifier level reflected by the second polarization beam splitter prism by after the first polarization beam splitter prism reflection, and reference light is interfered and record digital hologram on camera; Digital hologram is loaded in spatial light modulator, with main oscillations laser emitting light, (polarization direction is parallel to paper, transmission on polarization beam splitter prism) throw light on reconstructing hologram, the conjugation item PHASE DISTRIBUTION utilizing its reproducing is the characteristic of-Ф, as in local oscillator light from right to left injection amplification level, after amplifying step by step, obtain high-quality Laser output.
The flow chart of the execution mode one of a kind of beam cleanup method based on Digital Holography that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, in execution mode one, described method comprises:
S101: the first polarization beam splitter prism is to a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
S102: multiple laser amplifier level is to the reverberation R of described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
S103: the second polarization beam splitter prism is to the amplification light R with phase distortion information
4reflect, output reflection light R
5;
S104: CCD image sensor projects described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.
S105: spatial light modulator is at an emergent light R
7irradiation under export with the local oscillator light R of conjugate phase distribution character according to described digital hologram
8;
S106: the second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character
8carry out transmission;
S107: multiple laser amplifier level 200 is to the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export and amplify light R
10;
The amplification light R that S108: the first polarization beam splitter prism is right
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of beam cleanup method based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The flow chart of the execution mode two of a kind of beam cleanup method based on Digital Holography that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, in execution mode two, described method comprises:
S201: laser output laser beam R
1;
S202: coupler is by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
S203: the first polarization beam splitter prism 100 is to a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
S204: multiple laser amplifier level 200 is to the reverberation R of described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
S205: the second polarization beam splitter prism is to the amplification light R with phase distortion information
4reflect, output reflection light R
5;
S206: CCD image sensor projects described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
S207: spatial light modulator is at an emergent light R
7irradiation under export with the local oscillator light R of conjugate phase distribution character according to described digital hologram
8;
S208: the second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character
8carry out transmission;
S209: multiple laser amplifier level is to the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export and amplify light R
10;
S210: the first polarization beam splitter prism is to amplification light R
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of beam cleanup method based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The flow chart of the execution mode three of a kind of beam cleanup method based on Digital Holography that Fig. 3 provides for the embodiment of the present invention, as shown in Figure 3, in execution mode three, described method comprises:
S301: laser output laser beam R
1;
S302: coupler is by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
S303: the first polarization beam splitter prism is to a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
S304: multiple laser amplifier level is to the reverberation R of described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
S305: the second polarization beam splitter prism is to the amplification light R with phase distortion information
4reflect, output reflection light R
5;
S306: CCD image sensor projects described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
S307: main oscillations laser exports an emergent light R
7.The polarization direction of described emergent light is parallel to paper.
S308: spatial light modulator is at an emergent light R
7irradiation under export with the local oscillator light R of conjugate phase distribution character according to described digital hologram
8;
S309: the second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character
8carry out transmission;
S310: multiple laser amplifier level is to the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export and amplify light R
10;
S311: the first polarization beam splitter prism is to amplification light R
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
As mentioned above, be a kind of beam cleanup method based on Digital Holography provided by the invention, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
The flow chart of the execution mode four of a kind of beam cleanup method based on Digital Holography that Fig. 4 provides for the embodiment of the present invention, as shown in Figure 4, in execution mode four, described method comprises:
S401: laser output laser beam R
1;
S402: coupler is by described laser beam R
1light splitting is a beacon beam R
2with a reference light R
6.In a particular embodiment, described coupler is fiber coupler.Described beacon beam R
2with reference light R
6polarization direction perpendicular to paper.
S403: the first polarization beam splitter prism is to a beacon beam R
2reflect, export the reverberation R of described beacon beam
3;
S404: multiple laser amplifier level is to the reverberation R of described beacon beam
3amplify, export the amplification light R with phase distortion information
4;
S405: the second polarization beam splitter prism is to the amplification light R with phase distortion information
4reflect, output reflection light R
5;
S406: CCD image sensor projects described reverberation R
5and a reference light R
6, and to described reverberation R
5and reference light R
6interfere, obtain digital hologram.
Digital Holography is the product that traditional optical holography, computer technology and detecting technique combine, have fast, in real time, the advantage of full filed and quantitative phase contrast imaging.One of digital hologram adaptive optical technique up-to-date application belonging to Digital Holography.Specific to the present invention, beacon beam R
2being carried phase distortion information Ф in laser amplifier level after first polarization beam splitter prism reflection is reflected by the second polarization beam splitter prism, and reference light R
6interfere and record digital hologram on camera.
S407: the digital hologram described in controller obtains, and described digital hologram is sent to spatial light modulator.
S408: main oscillations laser exports an emergent light R
7.The polarization direction of described emergent light is parallel to paper.
S409: spatial light modulator is at an emergent light R
7irradiation under export with the local oscillator light R of conjugate phase distribution character according to described digital hologram
8;
S410: the second polarization beam splitter prism is to the described local oscillator light R with conjugate phase distribution character
8carry out transmission;
S411: multiple laser amplifier level is to the local oscillator light R after described second polarization beam splitter prism transmission
9amplify, export and amplify light R
10;
S412: the first polarization beam splitter prism is to amplification light R
10export after carrying out transmission, obtain R
11.R herein
11for the light beam exported after beam cleanup, realize high-quality Laser output.
Digital hologram is loaded in spatial light modulator, with main oscillations laser emitting light R
7(polarization direction is parallel to paper, transmission on polarization beam splitter prism) throw light on reconstructing hologram, the conjugation item PHASE DISTRIBUTION utilizing its reproducing is the characteristic of-Ф, as in local oscillator light from right to left injection amplification level, after amplifying step by step, obtains high-quality Laser output.If the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.In a particular embodiment, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6
Beacon beam input power is enough little of to ensure that not affecting laser amplifier level normally works in this scenario.
As mentioned above, be a kind of beam cleanup method based on Digital Holography provided by the invention, (polarization direction is perpendicular to paper for beacon beam, polarization beam splitter prism reflects) be divided into two-way, wherein beacon beam is carried phase distortion information Ф in laser amplifier level reflected by the second polarization beam splitter prism by after the first polarization beam splitter prism reflection, and reference light is interfered and record digital hologram on camera; Digital hologram is loaded in spatial light modulator, with main oscillations laser emitting light, (polarization direction is parallel to paper, transmission on polarization beam splitter prism) throw light on reconstructing hologram, the conjugation item PHASE DISTRIBUTION utilizing its reproducing is the characteristic of-Ф, as in local oscillator light from right to left injection amplification level, after amplifying step by step, obtain high-quality Laser output.
Below in conjunction with concrete execution mode, introduce technical scheme of the present invention in detail.The present invention mainly studies the method with digital hologram, by adding in amplification (MOPA) laser system in local oscillator, the distortion utilizing detection light to obtain to bring due to laser medium thermal lensing effect, systematic error in laser amplifier level record are in the hologram, subsequently this digital hologram is loaded in transmission-type amplitude type LCD space light modulator, penetrate with the illumination of local oscillator laser emitting the conjugation playback light obtained and enter amplifying stage as local oscillator light, after amplifying step by step, obtain high-quality Laser output.
In a particular embodiment, diode pumping Nd:YAG laser, single pulse energy 300mJ, repetition 200Hz, pulse duration 10ns, optical design is implemented according to this programme, use Thorlabs CCD, pixel count 4.65 μm * 4.65 μm, pixel count 1280*1024; Reallight LCD space light modulator, pixel count 1024*768, Pixel Dimensions 18 μm.Laser after beam cleanup before output wave RMS be less than three/wavelength, realize high-quality Laser output.
In sum, the invention provides a kind of beam cleanup method based on Digital Holography and solid state laser, utilize first, second polarization beam splitter prism, multiple laser amplifier level obtains in laser amplifier level due to laser medium thermal lensing effect, the distortion that systematic error is brought also is recorded in digital hologram by CCD, subsequently this digital hologram is loaded in spatial light modulator, irradiate by emergent light the conjugation playback light obtained and enter amplifying stage as local oscillator light, high-quality Laser output is obtained after amplifying step by step, without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
Beneficial effect of the present invention is:
1. carry out digital hologram collection with CCD, have feature that is quick, real-time, full filed, gather wave front data with traditional Hartmann wave front sensor and compare, resolution improves greatly, thus can go out higher order wave front-distortion by accurately detecting.
2., by amplitude type transmission liquid crystal spatial light modulator, its resolution is high, and correction accuracy is high, can correct higher order wave front-distortion, forms high-quality Laser output.
3. adopt the digital hologram method of " digital record-optical reproduction ", improve digital hologram recording and reconstruction speed, be applicable to adaptive optics application.
4. in the program without the need to carrying out phase control to light laser wavefront, avoid thermal distoftion and the fire damage of optical element, be applicable to the application in high power laser system.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, the hardware that can carry out instruction relevant by computer program has come, described program can be stored in general computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random AccessMemory, RAM) etc.
Those skilled in the art can also recognize that the various functions that the embodiment of the present invention is listed are the designing requirements realizing depending on specific application and whole solid state laser by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Apply specific embodiment in the present invention to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (18)
1. based on a solid state laser for Digital Holography, it is characterized in that, described solid state laser comprises:
First polarization beam splitter prism, for reflecting a beacon beam, exports the reverberation of described beacon beam;
Multiple laser amplifier level, for amplifying the reverberation of described beacon beam, exports the amplification light with phase distortion information;
Second polarization beam splitter prism, for reflecting the amplification light with phase distortion information, output reflection light;
CCD image sensor, for projecting described reverberation and a reference light, and interfering described reverberation and reference light, obtaining digital hologram;
Spatial light modulator, for exporting the local oscillator light with conjugate phase distribution character according to described digital hologram under the irradiation of an emergent light;
Second polarization beam splitter prism, for carrying out transmission to the described local oscillator light with conjugate phase distribution character;
Multiple laser amplifier level, for amplifying the local oscillator light after described second polarization beam splitter prism transmission, exporting and amplifying light;
First polarization beam splitter prism, exports after carrying out transmission to amplification light.
2. the solid state laser based on Digital Holography according to claim 1, is characterized in that, described solid state laser also comprises:
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.
3. the solid state laser based on Digital Holography according to claim 2, is characterized in that, described coupler is fiber coupler.
4. the solid state laser based on Digital Holography according to claim 2, is characterized in that, the polarization direction of described beacon beam and reference light is perpendicular to paper.
5. the solid state laser based on Digital Holography according to claim 2, is characterized in that, described solid state laser also comprises:
Main oscillations laser, for exporting an emergent light.
6. the solid state laser based on Digital Holography according to claim 5, is characterized in that, the polarization direction of described emergent light is parallel to paper.
7. the solid state laser based on Digital Holography according to claim 2 or 5, is characterized in that:
If the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.
8. the solid state laser based on Digital Holography according to claim 7, is characterized in that, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6.
9. the solid state laser based on Digital Holography according to claim 8, is characterized in that, described solid state laser also comprises:
Controller, for obtaining described digital hologram, and is sent to spatial light modulator by described digital hologram.
10. based on a beam cleanup method for Digital Holography, it is characterized in that, described method comprises:
First polarization beam splitter prism reflects a beacon beam, exports the reverberation of described beacon beam;
The reverberation of multiple laser amplifier levels to described beacon beam amplifies, and exports the amplification light with phase distortion information;
Second polarization beam splitter prism reflects the amplification light with phase distortion information, output reflection light;
CCD image sensor projects described reverberation and a reference light, and interferes described reverberation and reference light, obtains digital hologram;
Spatial light modulator exports the local oscillator light with conjugate phase distribution character according to described digital hologram under the irradiation of an emergent light;
Second polarization beam splitter prism carries out transmission to the described local oscillator light with conjugate phase distribution character;
Multiple laser amplifier level is amplified the local oscillator light after described second polarization beam splitter prism transmission, exports and amplifies light;
First polarization beam splitter prism carries out transmission to amplification light, the light beam after output beam purification.
11. methods according to claim 10, is characterized in that, described method also comprises:
Laser output laser beam;
Described laser beam light splitting is a beacon beam and a reference light by coupler.
12. methods according to claim 11, is characterized in that, described coupler is fiber coupler.
13. methods according to claim 11, is characterized in that, the polarization direction of described beacon beam and reference light is perpendicular to paper.
14. methods according to claim 11, is characterized in that, described method also comprises:
Main oscillations laser exports an emergent light.
15. methods according to claim 14, is characterized in that, the polarization direction of described emergent light is parallel to paper.
16. methods according to claim 11 or 14, is characterized in that:
If the angle of described reference light and CCD is the first angle, the angle of described emergent light and spatial light modulator is the second angle, then the first described angle is identical with the second angle number of degrees.
17. methods according to claim 16, is characterized in that, the number of described multiple laser amplifier levels is 1 or 2 or 4 or 6.
18. methods according to claim 17, is characterized in that, described method also comprises:
Digital hologram described in controller obtains, and described digital hologram is sent to spatial light modulator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870441A (en) * | 2016-09-23 | 2018-04-03 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of optical-fiber laser optics coherence tomography method based on digital hologram |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102402172A (en) * | 2011-11-30 | 2012-04-04 | 昆明理工大学 | Three-dimensional real time super-resolution digital holography recording system |
| CN202502512U (en) * | 2011-11-26 | 2012-10-24 | 北京工业大学 | Reflective digital holographic fingerprint imaging apparatus |
| US20130033695A1 (en) * | 2010-04-06 | 2013-02-07 | Korea Advanced Institute Of Science And Technology | High-energy laser system intercepting a target and method thereof |
| CN203012354U (en) * | 2012-10-23 | 2013-06-19 | 深圳大学 | Phase-shifting digital holography high-speed imaging system |
-
2014
- 2014-12-15 CN CN201410776555.5A patent/CN104538827B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259236A (en) * | 1997-06-06 | 2000-07-05 | 托山纳有限公司 | Laser systems using phase conjugate feedback |
| US20130033695A1 (en) * | 2010-04-06 | 2013-02-07 | Korea Advanced Institute Of Science And Technology | High-energy laser system intercepting a target and method thereof |
| 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 |
| CN202502512U (en) * | 2011-11-26 | 2012-10-24 | 北京工业大学 | Reflective digital holographic fingerprint imaging apparatus |
| CN102402172A (en) * | 2011-11-30 | 2012-04-04 | 昆明理工大学 | Three-dimensional real time super-resolution digital holography recording system |
| CN203012354U (en) * | 2012-10-23 | 2013-06-19 | 深圳大学 | Phase-shifting digital holography high-speed imaging system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870441A (en) * | 2016-09-23 | 2018-04-03 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of optical-fiber laser optics coherence tomography method based on digital hologram |
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