A 3.9 µm Ho3+:BYF laser pumped by a three-mirror cavity Cr:LiSAF laser with high optical-to-optical efficiency

Chaoqun Ma; Ying Zhang; He Cai; Juhong Han; Kepeng Rong; Guofei An; Jiawei Guo; Xiaoxu Liu; Haoyu Li; Jiao Yang; Qing Luo; You Wang

doi:10.1117/12.2606681

30 December 2021 A 3.9 μm Ho³⁺:BYF laser pumped by a three-mirror cavity Cr:LiSAF laser with high optical-to-optical efficiency

Chaoqun Ma, Ying Zhang, He Cai, Juhong Han, Kepeng Rong, Guofei An, Jiawei Guo, Xiaoxu Liu, Haoyu Li, Jiao Yang, Qing Luo, You Wang

Author Affiliations +

Proceedings Volume 12061, AOPC 2021: Infrared Device and Infrared Technology; 1206123 (2021) https://doi.org/10.1117/12.2606681
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

In this paper, a widely tunable Cr:LiSAF laser with an external cavity was employed as the pump source. By using a triangular prism and double output couplers in the cavity, the line width can be narrowed and the pump center wavelength can be adjusted to the ideal value. The FWHM in spectrum of a pump laser can be narrowed to as small as 0.5 nm. The absorptivity of Ho:BYF at the center wavelength from 885 nm to 890 nm was measured, and the optimal pump center wavelength has been determined to 888.5 nm. Then the focal length of a focusing lens and the curvature radius of a laser output coupler have been optimized through a series of experiments. Finally, we have obtained the laser output at 3.9 μm with the optical-to-optical efficiency larger than 10% at the relatively low repetitive rate. The results might be helpful for the construction of a real laser system.

Citation Download Citation

Chaoqun Ma, Ying Zhang, He Cai, Juhong Han, Kepeng Rong, Guofei An, Jiawei Guo, Xiaoxu Liu, Haoyu Li, Jiao Yang, Qing Luo, and You Wang "A 3.9 μm Ho³⁺:BYF laser pumped by a three-mirror cavity Cr:LiSAF laser with high optical-to-optical efficiency", Proc. SPIE 12061, AOPC 2021: Infrared Device and Infrared Technology, 1206123 (30 December 2021); https://doi.org/10.1117/12.2606681

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