Optical parametric oscillators (OPOs) based on AgGaSe2 and BaGa2GeSe6, and difference-frequency generation (DFG) in AgGaSe2 and BaGa4Se7 are studied inside the cavity of an oxide-crystal-based OPO to produce widely-tunable mid-IR radiation in the 4.4−18-µm range.

© 2019 The Author(s)

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