基于瑞利-索墨菲积分的大角度激光分束器设计

针对目前激光分束器只能产生小发散角的问题,基于严格的非傍轴近似的衍射积分公式,提出了一种大发散角分束器的设计方法.先对目标光场分布进行坐标和光强修整,再利用改进的GerchbergSaxton迭代算法得到所需分束器的相位分布.分别采用本文设计方法和原有方法设计了发散全角为40°×40°的5×5分束器,仿真和实验结果表明:原有方法设计得到的5×5子光束存在着显著的枕形畸变,并且光强分布不均匀.而本文方法设计得到的子光束呈均匀等间隔排列,并且强度分布更为均匀.

Designof the Laser Beam Splitter with Large Diffraction Angle Based on Rayleigh-Sommerfeld Intergral

In order to solve the problem that the rencent design method can only fit the small divergence angle situation,a novel method is prensented for disigning the beam laser splitter with large angle based on the Rayleigh-Sommerfeld Integral.In the design,firstly the target intensity distribution is modified with coordinate transformation and intensity adjustment,then the modified Gerchberg-Saxton algorithm is adopted to optimize the phase distribution of the beam laser splitter.Our method and original method are used to design the 5 × 5 splitter with 40° × 40° diffraction angle.The simulation and experiment result shows that original method shows significant pillow distortion and uneven intensity distribution.In contrast,the sub beams of the splitter designed by our method are well-proportioned and the intensity distribution is even.