CN101546037A - Model-free wavefront distortion correcting system based on spatial light modulator - Google Patents
Model-free wavefront distortion correcting system based on spatial light modulator Download PDFInfo
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Abstract
The invention provides a model-free wavefront distortion correcting system based on a spatial light modulator. The system consist of a polarizing sheet 1, a telescopic system 2, a beam splitter prism 3, a shrinkage device 4, a CCD camera 5, a computer system 6, the spatial light modulator 7, a wavefront controller 8 and a monitoring camera 9. The common CCD camera is adopted to form images; a Strehl ratio of beams is analyzed according to the model-free iteration theory to obtain control signals of optimization parameters required by a wavefront corrector; the performance indexes of the system such as imaging definition, receiving light energy and the like are directly used as objective functions of an optimization algorithm to optimize and acquire the correction effect close to a diffraction limit; and the optimization parameters are calculated in parallel by a computer with a graph processor, the acquired multi-channel control signals are transmitted to the wavefront controller, and then the wavefront controller drives the spatial light modulator to achieve real-time correction of wavefront distortion phase so as to effectively solve the problem of wavefront distortion in atmospheric laser communication.
Description
Technical field
The present invention relates to model-free wavefront distortion correcting system based on spatial light modulator.
Background technology
Along with laser industry, the national defence Application for Field, atmosphere is subjected to extensive attention to the influence of Laser Transmission.Atmosphere to the main influence of laser is: Atmospheric Absorption, atmospheric scattering and atmospheric turbulence effect, wherein atmospheric turbulence effect having the greatest impact to the Laser Transmission communication quality.The main influence of atmospheric turbulence effect is the expansion of light intensity flicker, phase fluctuation, arrival angle fluctuation, light beam and drift etc., and the bit error rate of atmosphere laser communication system is improved, and communication is interrupted.
The core content of tradition adaptive optics is that the beam aberration wavefront is proofreaied and correct in real time, to improve the image quality of optical system.Tradition adaptive optics corrective system adopts wave front detector to survey distorted wavefront, according to the image information reconstruct incident wavefront of surveying, re-uses wave-front corrector distorted wavefront is proofreaied and correct in computing machine, can obtain ideal image at monitor system.The tradition adaptive optical technique has obtained using widely in fields such as astronomical imaging, human eye aberration detection, beam quality analysis and optical element detections.
Tradition adaptive optics corrective system as shown in Figure 1, be by, telescopic system 1, Amici prism 2, the bundle device 3 that contracts, wave front detector 4, computer system 5, wave-front corrector 6, wavefront controller 7, monitoring camera 8 are formed.Telescopic system 1, Amici prism 2 and wave-front corrector 6 coaxial being arranged in order.Contract that bundle device 3 and wave front detector 4 are placed on the reflection direction of Amici prism 2 and with Amici prism 4 coaxial being arranged in order.Monitoring camera 8 is placed on and bundle device 3 corresponding Amici prism 2 opposite sides that contract, and is used for received signal.
Light beam is received by telescopic system 1 through atmosphere, is divided into two bundle collimated light beams through Amici prism 2, and a branch of light contracts through the bundle device 3 that contracts behind the bundle, is received by wave front detector 4, and computer system 5 calculates the closed-loop control signal of wavefront controller 7; Another Shu Guang injects wave-front corrector 6, wavefront controller 7 control wave-front correctors 6, and the phase place of the light beam of wave-front corrector 6 is injected in adjustment in real time; Adjusted light beam through Amici prism 3 reflections, obtains desirable imaging by monitoring camera 8 once more by wave-front corrector 6 reflections, and the realization adaptive optics is proofreaied and correct.(list of references: 1, Zhou Renzhong. adaptive optics [M]. Beijing: National Defense Industry Press 1996.2, Jiang Wenhan. adaptive optical technique [J]. Nature Journal .2005 (7) .28 rolls up 1 phase .3, Jiang Wenhan, Wu Xubin, .37 unit self-adapting optical systems such as Ling Ning. photoelectric project, 1995,22 (1): 38～45.4, Ye Jiaxiong, Yu Yonglin. adaptive optics [M]. Wuhan: publishing house of HUST, 1992.5, YEJia-xiong, YU Yong-lin.Adaptive optics[M] .Wuhan:HuazhongUniversity of Science and Technology (HUST) Press, 1992.)
Expansion along with the laser technology application, as free space optical communication, laser ranging etc., the phase fluctuation phenomenon causes Beam Wave-Front to produce uncontinuity, brings very big error to Wavefront detecting, can't realize the compensation based on phase conjugation, compensation effect is very limited, cause the wavefront measurement difficulty, cause the traditional ADAPTIVE OPTICS SYSTEMS cisco unity malfunction that relies on wavefront measurement, therefore the application in these cases of traditional adaptive optics control technology just seems powerless.And the adaptive optical technique that need not Wavefront sensor can address this problem.(list of references: 1, Yang Huizhen, Cai Dongmei, Chen Bo, Li Xinyang, Jiang Wenhan. sensing adaptive optical technique and the application .[J in atmospheric optical communication thereof before calm] Chinese laser .2008 (5). the 35th the 5th phase of volume; 2, Li Min, Li Xinyang, Jiang Wenhan. the experimental study contrast [J] of linear phase inversion sensor and Hartmann sensor. optics journal .2008 (4). the 28th the 4th phase of volume; 3, Yang Huizhen, Li Xinyang, Jiang Wenhan. ADAPTIVE OPTICS SYSTEMS random paralleling gradient decline control algolithm simulation and analysis [J]. optics journal .2007 (8). the 27th the 8th phase of volume; 4, Li Dayu, Hu Lifa, Mu Quanquan, Xuan Li .GPU calculate the concurrency research [J] of LCD self-adapting optical wavefront reconstruct. liquid crystal with show .2007 (10). the 22nd rolled up for the 5th phase).
The present invention is in order to overcome above-mentioned deficiency and shortcoming, and according to the development of Modern Optics Technology and dynamic optical technology, combining adaptive optical system technology development situation has proposed the model-free wavefront distortion correcting system based on spatial light modulator.Adopt the common CCD camera imaging,, draw the control signal of the required optimization parameter of wave-front corrector according to the Si Telieer ratio of model-free iteration theory analysis light beam; Directly as the objective function of optimized Algorithm, optimization obtains near desirable calibration result with system performance index such as imaging definition, reception luminous energies; Optimize parameter and carry out parallel computation, and pass to the wavefront controller, by the wavefront controller spatial light modulator is driven again, realize the correction of real-time distorted wavefront phase place obtaining multichannel control signal by the computing machine that has graphic process unit.The present invention efficiently solves under condition widely the problem of wavefront distortion in the lasercom.
Compare with traditional adaptive optics corrective system, reduce greatly based on the model-free wavefront distortion correcting system complicacy of spatial light modulator; Owing to need not to carry out Wavefront detecting, relatively be applicable to the lasercom that scintillation effect is comparatively serious, applications such as laser ranging based on the model-free wavefront distortion correcting system of spatial light modulator.
Model-free wavefront distortion correcting system based on spatial light modulator adopts the random paralleling gradient descent algorithm, and each control channel of parallel control wave-front corrector makes speed of convergence improve greatly; Spatial light modulator adopts LCD space light modulator as the wavefront correction device, has that low cost, good reliability, volume are little, a low energy consumption, easily and advantage such as control, and comparing distorting lens has bigger application space; Graphic process unit capture card multi-channel data fan-out capability has realized the collection and the processing of fast parallel view data, effectively improves the control bandwidth and the precision of corrective system, thereby the influence of atmospheric turbulence is carried out fully effectively suppressing.
Summary of the invention
The present invention is based on the model-free wavefront distortion correcting system of spatial light modulator, adopt the common CCD camera imaging, analyze the Si Telieer ratio of light beam according to the model-free iteration theory, draw the control signal of the required optimization parameter of wave-front corrector, with imaging definition, receive system performance index such as luminous energy directly as the objective function of optimized Algorithm, optimize the calibration result that obtains near diffraction limit, optimize parameter and carry out parallel computation by the computing machine that has graphic process unit, and pass to the wavefront controller obtaining multichannel control signal, by the wavefront controller spatial light modulator is driven again, realize the correction of real-time distorted wavefront phase place, thereby effectively solved the problem of wavefront distortion in the lasercom.
The present invention is based on the model-free wavefront distortion correcting system of spatial light modulator, adopt the common CCD camera imaging, analyze the Si Telieer ratio of light beam according to the model-free iteration theory, draw the control signal of the required optimization parameter of wave-front corrector, with imaging definition, receive system performance index such as luminous energy directly as the objective function of optimized Algorithm, optimize and obtain near desirable calibration result, optimize parameter and carry out parallel computation by the computing machine that has graphic process unit, and pass to the wavefront controller obtaining multichannel control signal, by the wavefront controller spatial light modulator is driven again, realize the correction of real-time distorted wavefront phase place, thereby effectively solved the problem of wavefront distortion in the lasercom.
The present invention is a kind of model-free wavefront distortion correcting system based on spatial light modulator, it is characterized in that this system is made up of polarizer slice 1, telescopic system 2, Amici prism 3, spatial light modulator 7, wavefront controller 8, monitoring camera 9, imaging system 10; Wherein imaging system 10 is made up of contract bundle device 4, CCD camera 5 and computer system 6.
Polarizer slice 1, telescopic system 2, Amici prism 3 and spatial light modulator 7 coaxial being arranged in order; Contract that bundle device 4 and CCD camera 5 are placed on the reflection direction of Amici prism 3 and with Amici prism 3 coaxial being arranged in order; CCD camera 5 links to each other with computer system 6; Wavefront controller 8 one ends link to each other with spatial light modulator 7, and the other end is connected with computer system 6; Monitoring camera 9 is placed on the opposite side with the bundle device 4 corresponding Amici prisms 3 that contract, and is used for received signal.
1, light beam carries out the linear polarization modulation through polarizer slice 1 earlier through atmosphere, is received by telescopic system 2, is divided into two-beam through Amici prism 3, the bundle device 4 that contracts in a branch of smooth incident imaging system 10, another bundle light incident spatial light modulator 7;
2, incident is contracted the light beam of bundle device 4 through the bundle that contracts, by 5 receptions of CCD camera; The image pick-up card that computer system 6 assemblings have graphics processing function can carry out multi-channel parallel collection, deal with data information, and the image pick-up card of computer system 6 obtains light spot image in real time from CCD camera 5; Adopt the random paralleling gradient descent algorithm, calculate control signal by computer system 6 and pass to wavefront controller 8;
3, wavefront controller 8 is proofreaied and correct with the light beam that driving voltage drives 7 pairs of incident spatial light modulators 7 of spatial light modulator;
4, described random paralleling gradient descent algorithm, Si Telieer ratio J with light beam is performance index, analyze the parameter variation delta J of these performance index, carry out the gradient estimation according to the variation delta J of performance index and the variation delta u of driving voltage, the parameter Δ J of performance index directly as the objective function of optimized Algorithm, is optimized on the gradient descent direction with iterative manner and obtains driving voltage.During the k time iteration, driving voltage is u
(k+1)=u
(k)+ γ u
(k)J
(k)Wherein, u
(k)The driving voltage vector that applies when being the k time iteration, γ are gain coefficient.
5, the light beam after spatial light modulator 7 is proofreaied and correct once more through Amici prism 3 reflections, by the signal of monitoring after camera 9 obtains proofreading and correct, is finished the real-time calibration function of laser wavefront distortion in the propagation in atmosphere process.
Description of drawings
Traditional adaptive optics corrective system structural representation in Fig. 1 laser communication system;
Fig. 2 is based on the model-free wavefront distortion correcting system synoptic diagram of spatial light modulator.
Embodiment
The present invention is a kind of model-free wavefront distortion correcting system based on spatial light modulator, it is characterized in that this system is made up of polarizer slice 1, telescopic system 2, Amici prism 3, spatial light modulator 7, wavefront controller 8, monitoring camera 9, imaging system 10; Wherein imaging system 10 is made up of contract bundle device 4, CCD camera 5 and computer system 6.
Polarizer slice 1, telescopic system 2, Amici prism 3 and spatial light modulator 7 coaxial being arranged in order; Contract that bundle device 4 and CCD camera 5 are placed on the reflection direction of Amici prism 3 and with Amici prism 3 coaxial being arranged in order; CCD camera 5 links to each other with computer system 6; Wavefront controller 8 one ends link to each other with spatial light modulator 7, and the other end is connected with computer system 6; Monitoring camera 9 is placed on the opposite side with the bundle device 4 corresponding Amici prisms 3 that contract, and is used for received signal.
1, light beam carries out the linear polarization modulation through polarizer slice 1 earlier through atmosphere, is received by telescopic system 2, is divided into two-beam through Amici prism 3, the bundle device 4 that contracts in a branch of smooth incident imaging system 10, another bundle light incident spatial light modulator 7;
2, incident is contracted the light beam of bundle device 4 through the bundle that contracts, by 5 receptions of CCD camera; The image pick-up card that computer system 6 assemblings have graphics processing function can carry out multi-channel parallel collection, deal with data information, and the image pick-up card of computer system 6 obtains light spot image in real time from CCD camera 5; Adopt the random paralleling gradient descent algorithm, calculate control signal by computer system 6 and pass to wavefront controller 8;
3, wavefront controller 8 is proofreaied and correct with the light beam that driving voltage drives 7 pairs of incident spatial light modulators 7 of spatial light modulator;
4, described random paralleling gradient descent algorithm, Si Telieer ratio J with light beam is performance index, analyze the parameter variation delta J of these performance index, carry out the gradient estimation according to the variation delta J of performance index and the variation delta u of driving voltage, the parameter Δ J of performance index directly as the objective function of optimized Algorithm, is optimized on the gradient descent direction with iterative manner and obtains driving voltage.During the k time iteration, driving voltage is u
(k+1)=u
(k)+ γ u
(k)J
(k)Wherein, u
(k)The driving voltage vector that applies when being the k time iteration, γ are gain coefficient.
5, the light beam after spatial light modulator 7 is proofreaied and correct once more through Amici prism 3 reflections, by the signal of monitoring after camera 9 obtains proofreading and correct, is finished the real-time calibration function of laser wavefront distortion in the propagation in atmosphere process.
Claims (3)
1, the present invention relates to a kind of model-free wavefront distortion correcting system based on spatial light modulator, it is characterized in that this system is made up of polarizer slice (1), telescopic system (2), Amici prism (3), spatial light modulator (7), wavefront controller (8), monitoring camera (9), imaging system (10); Wherein imaging system (10) is made up of contract bundle device (4), CCD camera (5) and computer system (6).
2, polarizer slice (1), telescopic system (2), Amici prism (3) and coaxial being arranged in order of spatial light modulator (7); Contract that bundle device (4) and CCD camera (5) are placed on the reflection direction of Amici prism (3) and with coaxial being arranged in order of Amici prism (3); CCD camera (5) links to each other with computer system (6); Wavefront controller (8) one ends link to each other with spatial light modulator (7), and the other end is connected with computer system (6); Monitoring camera (9) is placed on the opposite side with the bundle corresponding Amici prism of device (4) (3) that contracts, and is used for received signal.
3, light beam is through atmosphere, carry out the linear polarization modulation through polarizer slice (1) earlier, receive, be divided into two-beam through Amici prism (3) by telescopic system (2), the bundle device (4) that contracts in a branch of smooth incident imaging system (10), another restraints light incident spatial light modulator (7);
Incident is contracted the light beam of bundle device (4) through the bundle that contracts, and is received by CCD camera (5); The image pick-up card that computer system (6) assembling has graphics processing function can carry out multi-channel parallel collection, deal with data information, and the image pick-up card of computer system (6) obtains light spot image in real time from CCD camera (5); Adopt the random paralleling gradient descent algorithm, calculate control signal by computer system (6) and pass to wavefront controller (8);
Wavefront controller (8) drives spatial light modulator (7) with driving voltage the light beam of incident spatial light modulator (7) is proofreaied and correct;
Light beam after spatial light modulator (7) is proofreaied and correct passes through Amici prism (3) reflection once more, by the signal of monitoring after camera (9) obtains proofreading and correct, finishes the real-time calibration function of laser wavefront distortion in the propagation in atmosphere process.
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| CN104020563A (en) * | 2014-05-26 | 2014-09-03 | 中国计量学院 | Digital optical phase reverser adjustment device and method |
| CN104618017A (en) * | 2015-01-21 | 2015-05-13 | 中国科学院上海光学精密机械研究所 | Device and method for improving wavefront quality of atmosphere laser communication link |
| CN104639235A (en) * | 2015-01-20 | 2015-05-20 | 长春理工大学 | Integrated system with simultaneous laser ranging, polarization imaging and laser communication |
| CN105785609A (en) * | 2016-04-28 | 2016-07-20 | 长春理工大学 | Wavefront correction method and device based on transmission-type liquid crystal space light modulator |
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