High-quality laser beam diagnostics using modified coherent phase modulation imaging

被引：9
|
作者：
He, Xiaoliang [1 ,2 ,3 ]
Tao, Hua [1 ,2 ]
Pan, Xingchen [1 ,2 ]
Liu, Cheng [1 ,2 ]
Zhu, Jianqiang [1 ,2 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab High Power Laser & Phys, Shanghai 201800, Peoples R China
[2] Chinese Acad Sci, China Acad Engn Phys, Natl Lab High Power Laser & Phys, Shanghai 201800, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
OPTICS EXPRESS | 2018年 / 26卷 / 05期
基金：
中国国家自然科学基金;
关键词：
FOCAL-SPOT CHARACTERIZATION; RETRIEVAL ALGORITHMS; FOURIER-TRANSFORM; RECONSTRUCTION; MICROSCOPY; CONSTRAINT; MODULUS; OBJECT;
D O I：
10.1364/OE.26.006239
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Coherent modulation imaging (CMI) is a promising technique for online laser beam diagnostics; however, obvious speckle noise is always generated in the reconstruction, seriously degrading the spatial resolution and, accordingly, the accuracy. To solve this problem, both the optical setup of the common CMI and its reconstruction algorithm are slightly modified, and the performance of CMI in laser beam diagnostics can be obviously improved. By adding the second detector to record additional intensity distribution and using it to strengthen the intensity constraint of common CMI algorithm, the speckle noise in the reconstructed image can be distinctively reduced, and thus both the spatial resolution and the measurement accuracy are improved significantly. The feasibility of this proposed method is verified by proof-of-principle experiments. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：6239 / 6248
页数：10
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