低散斑环形光束整形器件的设计及实验  

Design and Experiments of Annular Beam Shaping Device with Low Speckle Noise

作　　者：刘文静 庞辉[2] 曹阿秀[2] 史立芳[2] 付永启 邓启凌[2] LIU Wen-jing;PANG Hui;CAO A-xiu;SHI Li-fang;FU Yong-qi;DENG Qi-ling(College of Physics,University of Electronic Science and Technology,Chengdu 611731,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]电子科技大学物理学院,成都611731 [2]中国科学院光电技术研究所,成都610209 [3]中国科学院大学,北京100049

出　　处：《光子学报》2020年第2期93-101,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.51703227,C0025053,61605211,61905251);中科院科研仪器设备研制项目(No.YJKYYQ20180008);中科院西部之光人才支撑计划;国家重点研发计划(No.2017YFC0804900);四川省科技计划项目(No.2019YJ0014);中国科学院青年创新促进会~~

摘　　要：提出一种可有效抑制散斑噪声的衍射元件设计方法.在传统Gerchberg-Saxton算法的基础上,通过选择一种特殊的初始相位,在不降低衍射效率的同时,有效提升光斑的均匀性.以将高斯光束整形成环形平顶光束为例,开展了数值仿真和光学实验.结果表明,利用该方法和传统Gerchberg-Saxton算法设计得到的环形平顶光束散斑对比度分别为11%和34%,验证了该方法可以获得低散斑噪声的环形平顶光束.A design method of diffractive element that can effectively suppress speckle noise is proposed.Based on the traditional Gerchberg-Saxton algorithm,the uniformity of the light spot is effectively improved without reducing the diffraction efficiency by selecting a special initial phase.Taking the Gaussian beam shaped into an annular flat-top beam as an example,numerical simulation and optical experiments are carried out.The results show that the speckle contrasts of the annular flat-top beams obtained by using the proposed method and the traditional Gerchberg-Saxton algorithm are 11% and 34%,respectively,which verifies the proposed method can obtain a annular flat-top beam with low speckle noise.

关 键 词：衍射光学元件 光束整形 Gerchberg-Saxton算法 空间光调制器 散斑抑制 

分 类 号：O439[机械工程—光学工程]