Mr. Haonan Wang Profile

Haonan Wang

at Tongji Univ

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Proceedings Article | 4 December 2020 Paper

Study on the optical loss of thin-film narrowband filter

Haonan Wang, Xiaochuan Ji, Jinlong Zhang, Xinbin Cheng

Proceedings Volume 11617, 116172I (2020) https://doi.org/10.1117/12.2585330

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Thin-film narrowband filter can be used as a beam combining component in a laser beam combining system, the output beam has the advantages of narrow spectral width, good wavelength stability and high brightness. However, due to the narrow cut-off band, the electric field inside the thin film structure is very large under the laser irradiation, which leads to the great absorption and scattering losses of the thin film and affects the output beam quality. In this paper, we analyze the electric field distribution and measure the absorption and scattering losses of the thin film filter working around the wavelength of 1064nm by continuous high-power laser irradiation. Moreover, the influence of annealing process as well as super polished substrate on the absorption and scattering losses and transmission spectrum of the filter is explored.

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