High precision measurement method of laser divergence angle based on CCD imaging

Cheng-hao Jiang; Jing-guo Zhu; Feng Li; Meng-lin Li; Yang Hu

doi:10.1117/12.2283454

24 October 2017 High precision measurement method of laser divergence angle based on CCD imaging

Cheng-hao Jiang, Jing-guo Zhu, Feng Li, Meng-lin Li, Yang Hu

Proceedings Volume 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications; 104621B (2017) https://doi.org/10.1117/12.2283454
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

The use of CCD imaging to measure laser divergence angle and imaging spot quality directly affect the accuracy of measurement results. Analysis of laser spot imaging features, do noise reduction and desaturation process for the image. With the method of image coordinate vectors superposition to obtain the laser intensity distribution curve in x, y direction, and laser spot diameter is exactly calculated by curve fitting algorithm. Experiment for different exposure intensity spot images, this method is effective to suppress the influence of CCD self-noise and improve measurement accuracy. Different exposure intensity spot images obtained a high measurement accuracy results, and laser divergence angle measurement results with an accuracy higher than 0.01mrad.

Citation Download Citation

Cheng-hao Jiang, Jing-guo Zhu, Feng Li, Meng-lin Li, and Yang Hu "High precision measurement method of laser divergence angle based on CCD imaging", Proc. SPIE 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications, 104621B (24 October 2017); https://doi.org/10.1117/12.2283454

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