Design and fabrication of dichroic filter with reduced absorption for spectral beam combining

Zhao Qiao; Junhui Die; Bingcheng Xiong; Jianpeng Cui; Yunti Pu; Jinyong Huang; Ping Ma

doi:10.1117/12.3014672

22 December 2023 Design and fabrication of dichroic filter with reduced absorption for spectral beam combining

Zhao Qiao, Junhui Die, Bingcheng Xiong, Jianpeng Cui, Yunti Pu, Jinyong Huang, Ping Ma

Proceedings Volume 12974, Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023); 1297408 (2023) https://doi.org/10.1117/12.3014672
Event: Fifth International Symposium on High Power Laser Science and Engineering, 2023, Suzhou, China

Abstract

Spectral beam combining technique is one of major approaches in power scaling of fiber lasers. In order to maximize beam-combining performance, maintain a high beam quality in the combining process, the absorption-induced wavefront distortion of the resulting combined beam must be considered. By reducing the film absorption, the dichroic filters will be promising competitors to dielectric gratings as crucial spectral beam combining elements. In this paper, two different structures: less-cavities (LC) structure and more-cavities (MC) structure of dichroic filter layers were carefully designed and fabricated by ion-beam sputtering deposition with high-precision layer thickness monitoring method. A photothermal scanning system based on laser-induced surface thermal lensing (STL) effect was used for analyzing the 1064nm wavelength absorption of dichroic filter layers in passband and stopband. Dichroic filter with reduced in-bandpass absorption was found in MC structure by relaxing the electric field strength in thin films. This approach is highly expected to have great potential for fabricating promising spectral beam combining dichroic filters with less thermal effect and higher laser-induced damage threshold (LIDT).

Citation Download Citation

Zhao Qiao, Junhui Die, Bingcheng Xiong, Jianpeng Cui, Yunti Pu, Jinyong Huang, and Ping Ma "Design and fabrication of dichroic filter with reduced absorption for spectral beam combining", Proc. SPIE 12974, Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023), 1297408 (22 December 2023); https://doi.org/10.1117/12.3014672

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KEYWORDS

Tunable filters

Absorption

Optical filters

Electric fields

Light absorption

Thermal effects

Reflection

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