随机散射光波的全局优化调幅聚焦

doi:10.3969/j.issn.1001-2400.2016.01.018

J4 ›› 2016, Vol. 43 ›› Issue (1): 99-104.doi: 10.3969/j.issn.1001-2400.2016.01.018

随机散射光波的全局优化调幅聚焦

龚昌妹;邵晓鹏;吴腾飞;代伟佳;刘杰涛;张建奇

(西安电子科技大学物理与光电工程学院，陕西西安 710071)

收稿日期:2014-09-08 出版日期:2016-02-20 发布日期:2016-04-06
通讯作者: 邵晓鹏
作者简介:龚昌妹(1983-)，女，西安电子科技大学博士研究生，E-mail: cmgong@mail.xidian.edu.cn．
基金资助:
陕西省留学人员科技活动项目择优资助项目(68DP1204)；优秀留学回国人员创新基金资助项目(6450051101)

Focusing of random scattering light by global optimization amplitude modulation

GONG Changmei;SHAO Xiaopeng;WU Tengfei;DAI Weijia;LIU Jietao;ZHANG Jianqi

(School of Physics and Optoelectronic Engineering, Xidian Univ., Xi'an 710071, China)

Received:2014-09-08 Online:2016-02-20 Published:2016-04-06
Contact: SHAO Xiaopeng

摘要/Abstract

摘要：

在基于反馈控制调节的随机散射光波调幅超衍射极限聚焦技术中，连续序列算法所采用的逐网格调制机制会大幅降低算法的抗噪性能，不利于低信噪比环境下光波的聚焦．为此，采用遗传算法来调制入射光的波前幅值，借助其特有的全局优化策略使所有网格的幅值得以同时调制和优化，从而降低算法对噪声的敏感程度．仿真结果表明，遗传算法优化所得的目标点光强几乎不受噪声水平的影响，且不同噪声水平下获得的最终聚焦光强非常接近，即使噪声水平上升到信噪比为10dB，聚焦光强也能达到信噪比为∞时的80.67％．

关键词: 随机散射介质, 幅值调制, 聚焦, 遗传算法, 连续序列算法

Abstract:

When focusing beyond diffraction-limit through the scattering medium with amplitude modulation by the feedback control algorithm, the grid-by-grid modulation scheme of the continuous sequential algorithm will severely degrade anti-noise performance, which is detrimental to focusing of light under low signal-to-noise ratio environment. To overcome the drawback of the continuous sequential algorithm, the genetic algorithm is introduced to shape the wavefront amplitude of incident light. With the help of its characteristic global optimization strategy, the amplitude of all the grids can be simultaneously modulated and optimized so as to reduce the sensitivity to noise. Simulation results show that the target focus intensity of the genetic algorithm can be hardly affected by noise level, and that the resultant focusing intensity acquired at different noise levels are very close. The focusing intensity value up to 80.67％ that of SNR is ∞ can be achieved even if the noise level rises to SNR is 10dB.

Key words: scattering medium, amplitude modulation, focusing, genetic algorithm(GA), continuous sequential algorithm(CSA)

中图分类号:

O436.1

龚昌妹;邵晓鹏;吴腾飞;代伟佳;刘杰涛;张建奇. 随机散射光波的全局优化调幅聚焦[J]. J4, 2016, 43(1): 99-104.

GONG Changmei;SHAO Xiaopeng;WU Tengfei;DAI Weijia;LIU Jietao;ZHANG Jianqi. Focusing of random scattering light by global optimization amplitude modulation[J]. J4, 2016, 43(1): 99-104.

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随机散射光波的全局优化调幅聚焦

Focusing of random scattering light by global optimization amplitude modulation

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