Measurement of crystal defects using phase retrieval technique

Yudong Yao; Junyong Zhang; Yanli Zhang; Jianqiang Zhu

doi:10.1117/12.2071246

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3 February 2015 Measurement of crystal defects using phase retrieval technique

Yudong Yao, Junyong Zhang, Yanli Zhang, Jianqiang Zhu

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92554M (2015) https://doi.org/10.1117/12.2071246
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

In high power laser systems, crystal defects introduced by manufacturing have significant impact on quality of light beams; finally affect the output status of high power laser system. The phase retrieval algorithm can precisely measure the crystal defects, such as the residual periodic perturbations in a relatively large area and the relatively small point defects, with the resolution of micrometer magnitude. At the same time, the multiple near-focus intensity measurements algorithm used here can retrieve the morphology of focal spot, which is modulated by the defects and cannot be directly measured due to its high power. In addition, the algorithm has been improved in order to use less measurement planes and less iteration times to complete retrieval.

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Yudong Yao, Junyong Zhang, Yanli Zhang, and Jianqiang Zhu "Measurement of crystal defects using phase retrieval technique", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92554M (3 February 2015); https://doi.org/10.1117/12.2071246

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