基于单压电变形镜的可控环形焦斑整形
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摘要
为了实现可控环形焦斑的整形,提出了一套基于单压电变形镜的整形方法。首先结合波前衍射理论和随机并行梯度下降算法模拟迭代出环形焦斑整形所需的调制相位,进而利用波前传感器探测光束的波前信息,控制变形镜重构目标光斑对应的调制相位,实现聚焦光斑的整形。搭建了一套基于62单元单压电变形镜的光斑整形实验平台,采用焦平面上的CCD记录远场聚焦光斑。实验结果表明,该方法实现了对不同直径(0.32,0.4,0.6 mm)和宽度(0.05,0.08,0.1mm)环形焦斑的整形,可有效应用于激光束整形。
In order to generate a tunable annular focal spot,a laser beam shaping method using a unimorph deformable mirror was proposed.The wavefront phase used for generating a target annular focal spot was simulated iteratively by combining diffraction theory and the stochastic Parallel Gradient Descent Algorithm(SPGD).The wavefront phase was then reproduced using a deformable mirror with the feedback of the measured wavefront obtained from a wavefront sensor to realize the shaping of the focal spot.A beam shaping system based on a unimorph deformable mirror with 62 actuators was established.The far-field focal spot was measured using a Charge Coupled Device(CCD)placed at the focal plane of the system.Annular focal spots with different diameters(0.32 mm,0.4 mm,and 0.6 mm)and widths(0.05 mm,0.08 mm,and 0.1 mm)were generated experimentally based on the proposed method.This demonstrates that the proposed method is suitable for laser beam shaping.
In order to generate a tunable annular focal spot,a laser beam shaping method using a unimorph deformable mirror was proposed.The wavefront phase used for generating a target annular focal spot was simulated iteratively by combining diffraction theory and the stochastic Parallel Gradient Descent Algorithm(SPGD).The wavefront phase was then reproduced using a deformable mirror with the feedback of the measured wavefront obtained from a wavefront sensor to realize the shaping of the focal spot.A beam shaping system based on a unimorph deformable mirror with 62 actuators was established.The far-field focal spot was measured using a Charge Coupled Device(CCD)placed at the focal plane of the system.Annular focal spots with different diameters(0.32 mm,0.4 mm,and 0.6 mm)and widths(0.05 mm,0.08 mm,and 0.1 mm)were generated experimentally based on the proposed method.This demonstrates that the proposed method is suitable for laser beam shaping.
引文
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[17]MA J Q,CHEN K,CHEN J J,et al..Closedloop correction and ocular wavefronts compensation of a 62-element silicon unimorph deformable mirror[J].Chinese Optics Letters,2015,13(4):042201.
[2]刘岚,张海涛,陈子阳,等.贝塞尔高斯光束经菲涅尔波带片产生特殊聚焦光强分布[J].红外与激光工程,2015,44(5):1491-1495.LIU L,ZHANG H T,CHEN Z Y,et al..Special intensity distribution by diffraction of Bessel-Gauss beams with Fresnel zone plate[J].Infrared and Laser Engineering,2015,44(5):1491-1495.(in Chinese)
[3]马学,李琦,鲁建业.太赫兹高斯光束整形环形光束[J].红外与激光工程,2017,46(5):198-205.MA X,LI Q,LU J Y.Caussian beam shaping terahertz Gaussian beam to ring beam[J].Infrared and Laser Engineering,2017,46(5):198-205.(in Chinese)
[4]HOFFNAGLE J A,JEFFERSON C M.Design and performance of a refractive optical system that converts a Gaussian to a flattop beam[J].Applied Optics,2000,39(30):5488-5499.
[5]YANG P,LIU Y,YANG W,et al..An adaptive laser beam shaping technique based on a genetic algorithm[J].Chinese Optics Letters,2007,5(9):497-500.
[6]蒋鹏志,马浩统,袁凌峰,等.基于并行梯度下降算法的自适应任意口径光束整形[J].中国激光,2011,38(12):37-41.JIANG P ZH,MA H T,YUAN L F,et al..Shaped beam of arbitrary size with adaptive optics based on stochastic parallel gradient descent algorithm[J].Chinese Journal of Lasers,2011,38(12):37-41.(in Chinese)
[7]林旭东,刘欣悦,王帅,等.桌面97单元自适应光学系统性能测试[J].光学精密工程,2016,24(6):1272-1280.LIN X D,LIU X Y,WANG SH,et al..Performance testing of a desk-top 97-element adaptive optical system[J].Opt.Precision Eng.,2016,24(6):1272-1280.(in Chinese)
[8]余湛,马浩统,杜少军.基于模拟退火算法的自适应近场光束整形[J].光学学报,2011,31(3):155-159.YU ZH,MA H T,DU SH J.Adaptive near-field beam shaping based on simulated annealing algorithm[J].Acta Optica Sinica,2011,31(3):155-159.(in Chinese)
[9]LEI X,XU B,YANG P,et al..Beam cleanup of a532-nm pulsed solid-state laser using a bimorph mirror[J].Chinese Optics Letters,2012,10(2):44-47.
[10]刘磊,郭劲,赵帅,等.随机并行梯度下降算法在激光束整形中的应用[J].中国光学,2014,7(2):260-266.LIU L,GUO J,ZHAO SH,et al..Application of stochastic parallel gradient descent algorithm in laser beam shaping[J].Chinese Optics,2014,7(2):260-266.(in Chinese)
[11]ZENG ZH G,LING N,JIANG W H.The investigation of controlling laser focal profile by deformable mirror and wave-front sensor[J].Journal of Modern Optics,1999,46(2):341-348.
[12]FENG Z,HUANG L,GONG M.Focal-plane irradiance tailoring using the concept of WooferTweeter deformable mirrors[J].Optics Express,2014,22(8):8871-8879.
[13]SHELDAKOVA J,KUDRYASHOV A,LYLOVA A.Formation of the desired light intensity distribution on the target with bimorph deformable mirror[J].SPIE,2015,9343(1):95-107.
[14]BROUSSEAU D,DRAPEAU J,PICH M,et al..Generation of Bessel beams using a magnetic liquid deformable mirror[J].Applied Optics,2011,50(21):4005-4010.
[15]GOODMAN J W.Introduction to Fourier optics[M].Roberts and Company Publishers,2005.
[16]刘莹,马剑强,何挺,等.模拟退火-爬山混合算法用于无波前传感器快速像差校正[J].光学精密工程,2012,20(2):213-219.LIU Y,MA J Q,HE T,et al..Hybrid simulated annealing-hill climbing algorithm for fast aberration correction without wavefront sensor[J].Opt.Precision Eng.,2012,20(2):213-219.(in Chinese)
[17]MA J Q,CHEN K,CHEN J J,et al..Closedloop correction and ocular wavefronts compensation of a 62-element silicon unimorph deformable mirror[J].Chinese Optics Letters,2015,13(4):042201.