光子学报, 2020, 49 (2): 0222001, 网络出版: 2020-03-19
低散斑环形光束整形器件的设计及实验 
下载： 704次
Design and Experiments of Annular Beam Shaping Device with Low Speckle Noise
衍射光学元件 光束整形 Gerchberg-Saxton算法 空间光调制器 散斑抑制 Diffractive optical element Beam shaping Gerchberg-Saxton algorithm Spatial light modulator Speckle suppression
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.
Abstract
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.
刘文静, 庞辉, 曹阿秀, 史立芳, 付永启, 邓启凌. 低散斑环形光束整形器件的设计及实验[J]. 光子学报, 2020, 49(2): 0222001. Wen-jing LIU, Hui PANG, A-xiu CAO, Li-fang SHI, Yong-qi FU, Qi-ling DENG. Design and Experiments of Annular Beam Shaping Device with Low Speckle Noise[J]. ACTA PHOTONICA SINICA, 2020, 49(2): 0222001.
PDF全文
