光学学报, 2017, 37 (6): 0626005, 网络出版: 2017-06-08
基于黄金分割法改进反馈波前整形技术实现散射光的聚焦
Focusing of Scattering Light by Improved Feedback Wavefront Shaping Technique Based on Golden Section Method
物理光学 散射介质 聚焦光斑 黄金分割法 相位调制 physical optics scattering medium focused spot golden section method phase modulation
摘要
通过对入射光束的相位进行调控, 可以将激光经过散射介质的散斑调制为聚焦光斑。提出了基于黄金分割法改进反馈波前整形技术的方法, 实现了光束经散射介质的聚焦。理论分析了黄金分割法相比现有的顺序算法在搜索单峰函数极大值时的优势, 并对散射聚焦过程进行了数值模拟。结果表明, 当改变总调制单元数和单个调制单元的相位调制精度时, 采用黄金分割法调制相位相比于顺序算法, 在调制速度上具有一定优势。
Abstract
Speckles of laser scattered by scattering media can be modulated into focused spots when the phase of incident beam is modulated. A method to improve feedback wavefront shaping technique based on golden section method is introduced, and the focusing of beam scattered by scattering media is realized. Compared with the sequential algorithm, the superiority of the golden section algorithm in searching maximum value of the unimodal function is theoretically analyzed, and the scattering focusing process is numerically simulated. The results show that golden section algorithm performs better than sequential algorithm in modulation rate when the total number of modulation segments and the phase modulation precision of a single segment are changed.
胡显声, 蒲继雄, 冀旋旋, 陈子阳. 基于黄金分割法改进反馈波前整形技术实现散射光的聚焦[J]. 光学学报, 2017, 37(6): 0626005. Hu Xiansheng, Pu Jixiong, Ji Xuanxuan, Chen Ziyang. Focusing of Scattering Light by Improved Feedback Wavefront Shaping Technique Based on Golden Section Method[J]. Acta Optica Sinica, 2017, 37(6): 0626005.