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16 November 2018 Online detection of hot image in the large aperture near field of the final optics assembly
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The beam quality information of 3ω laser is very important to analyze the damage problem in the final optics assembly in the high power laser system. Sometimes there is a hot image whose intensity is several times of the average intensity in the near field. It can easily damage the optical components. However, it is very hard to detect the hot image online due to its small spatial size in a large aperture near field, which is usually about 100μm or smaller. Here we propose a method to detect and evaluate the possibility of the hot image in the online experiment. It is based on the near field information of multiple resolutions. The hot image intensity can be deduced from the near filed modulation variations if there is any hot image in the near field. The method could give some references to the online near filed beam quality measurement and system damage diagnosis in the final optics assembly.
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Zhaoyang Jiao, Mingying Sun, and Jianqiang Zhu "Online detection of hot image in the large aperture near field of the final optics assembly", Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108052G (16 November 2018);

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