High-energy, tunable, long-wave mid-infrared optical parametric oscillator based on BaGa4Se7 crystal

A high-energy, tunable, long-wave mid-infrared optical parametric oscillator (OPO) based on the ${\rm{BaG}}{{\rm{a}}_4}{\rm{S}}{{\rm{e}}_7}$ crystal was demonstrated in this Letter with 1064 nm laser pumping. The mid-infrared OPO was designed as a double-pass single resonant oscillator (DP-SRO) to r...

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Bibliographic Details
Published in:Optics letters 2020-09, Vol.45 (18), p.5287-5290
Main Authors: Xu, Degang, Zhang, Jiaxin, He, Yixin, Wang, Yuye, Yao, Jiyong, Guo, Yangwu, Yan, Chao, Tang, Longhuang, Li, Jining, Zhong, Kai, Wu, Yicheng, Yao, Jianquan
Format: Article
Language:English
Subjects:
Crystals
Infrared lasers
Laser pumping
Optical Parametric Oscillators
Optimization
Parametric amplifiers
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Summary:A high-energy, tunable, long-wave mid-infrared optical parametric oscillator (OPO) based on the ${\rm{BaG}}{{\rm{a}}_4}{\rm{S}}{{\rm{e}}_7}$ crystal was demonstrated in this Letter with 1064 nm laser pumping. The mid-infrared OPO was designed as a double-pass single resonant oscillator (DP-SRO) to reduce the threshold and improve the outputs. Further optimization on the cavity length was theoretically and experimentally studied. With a short cavity length of 30 mm, the output energy of over 1 mJ/pulse at 11 µm was obtained with the pump energy of 39.5 mJ/pulse. In addition, a wide tuning range of 8–14 µm was experimentally achieved by rotating the ${\rm{BaG}}{{\rm{a}}_4}{\rm{S}}{{\rm{e}}_7}$ crystal.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.401956