Widely tunable (2.6–10.4 μ m) BaGa 4 Se 7 optical parametric oscillator pumped by a Q-switched Nd:YLiF 4 laser

Dmitry B. Kolker, Nadezhda Yu. Kostyukova, Аndrey А. Boyko, Valeriy V. Badikov, Dmitrii V. Badikov, A.G. Shadrintseva, N.N. Tretyakova, Konstantin G. Zenov, А. А. Карапузиков, J.‐J. Zondy

Journal of Physics Communications, 2018

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DOI 10.1088/2399-6528/aab007

Data confidence 70 medium

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Abstract

We report on the first BaGa 4 Se 7 nanosecond optical parametric oscillator pumped by Q-switched Nd:YLiF 4 laser at 1053 nm. The oscillator exhibits a pump threshold energy as low as 0.25 mJ. Mid-infrared (MIR) idler wave tuning from 2.6 μ m to 10.4 μ m is demonstrated with an angle-tuned type-I ( o-ee ) y -cut sample, highlighting the superior performance of this novel large bandgap chalcogenide nonlinear crystal to generate tunable coherent radiation over its full MIR transparency range (0.47–18 μ m). The phase-matching data are used to identify the most accurate dispersion relations of this compound among three recently published Sellmeier equations. Damage threshold measurements yielded values as high as 2.04 J cm −2 at 100 Hz pulse repetition rate, one of the largest among existing MIR χ (2) nonlinear materials.