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

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Abstract

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.

© 2020 Optical Society of America

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