High-conversion-efficiency tunable mid-infrared BaGa<sub>4</sub>Se<sub>7</sub> optical parametric oscillator pumped by a 2.79-&#x03BC;m laser

Shuwu Hu; Li Wang; Yangwu Guo; Tingqing Cheng; Xianyou Wu; Zhenyou Wang; Haixin Wu; Jiyong Yao; Yicheng Wu; Haihe Jiang

doi:10.1364/OL.44.002201

Optics Letters
Vol. 44,
Issue 9,
pp. 2201-2203
(2019)
•https://doi.org/10.1364/OL.44.002201

High-conversion-efficiency tunable mid-infrared BaGa₄Se₇ optical parametric oscillator pumped by a 2.79-μm laser

Shuwu Hu, Li Wang, Yangwu Guo, Tingqing Cheng, Xianyou Wu, Zhenyou Wang, Haixin Wu, Jiyong Yao, Yicheng Wu, and Haihe Jiang

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Shuwu Hu, Li Wang, Yangwu Guo, Tingqing Cheng, Xianyou Wu, Zhenyou Wang, Haixin Wu, Jiyong Yao, Yicheng Wu, and Haihe Jiang, "High-conversion-efficiency tunable mid-infrared BaGa₄Se₇ optical parametric oscillator pumped by a 2.79-μm laser," Opt. Lett. 44, 2201-2203 (2019)

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Abstract

A mid-infrared ${BaGa}_{4} {Se}_{7}$ optical parametric oscillator with high conversion efficiency and beam quality is demonstrated, which is pumped by a 2.79-μm electro-optically Q-switched Cr, Er:YSGG laser. A pulse energy of 3.5 mJ with a pulse width of 21 ns at 10 Hz is obtained in the range of 3.94–9.55 μm, and the beam quality factors are measured to be $M_{x}^{2} = 5.0$ and $M_{y}^{2} = 4.6$ . The optical-to-optical conversion efficiency is 18.9%, and the slope efficiency is 31.6%, which is a 59% improvement on the best of the previously reported slope efficiencies for ${BaGa}_{4} {Se}_{7}$ -based OPOs.

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