Effects of side subsurface defects induced by CNC machine on the gain spatial distribution in neodymium phosphate glass
The processing method applied to the side surface is different from the method applied to the light pass surface in neodymium phosphate glass (Nd:glass), and thus subsurface defects remain after processing. The subsurface defects in the side surface influence the gain uniformity of Nd:glass, which is a key factor to evaluate the performance of amplifiers. The scattering characteristics of side subsurface defects were simulated by finite difference time domain (FDTD) Solutions software. The scattering powers of the glass fabricated by a computer numerical control (CNC) machine without cladding were tested at different incident angles. The trend of the curve was similar to the simulated result, while the smallest point was different with the complex true morphology. The simulation showed that the equivalent residual reflectivity of the cladding glass can be more than 0.1% when the number of defects in a single gridding is greater than 50.
基金项目：This work is supported by National Natural Science Foundation of China (No. 61205212).
Junyong Zhang：Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Shuang Shi：Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Kewei You：Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Jianqiang Zhu：Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
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Bingyan Wang, Junyong Zhang, Shuang Shi, Kewei You, and Jianqiang Zhu, "Effects of side subsurface defects induced by CNC machine on the gain spatial distribution in neodymium phosphate glass," High Power Laser Science and Engineering 4(1), e9 (2016)