Kolker, DmitriKostyukova, N.Boyko, A.Badikov, V.Badikov, D.Shadrintseva, A.Tretyakova, N.Zenov, K.Karapuzikov, A.Zondy, Jean-Jacques2020-03-262020-03-262018Kolker, D. B., Kostyukova, N. Y., Boyko, A. A., Badikov, V. V., Badikov, D. V., Shadrintseva, A. G., … Zondy, J.-J. (2018). Widely tunable (2.6–10.4μm) BaGa4Se7optical parametric oscillator pumped by a Q-switched Nd:YLiF4laser. Journal of Physics Communications, 2(3), 35039. https://doi.org/10.1088/2399-6528/aab0072399-652810.1088/2399-6528/aab007https://iopscience.iop.org/article/10.1088/2399-6528/aab007/pdfhttp://nur.nu.edu.kz/handle/123456789/4545https://iopscience.iop.org/article/10.1088/2399-6528/aab007We report on the first BaGa4Se7 nanosecond optical parametric oscillator pumped by Q-switched Nd:YLiF4 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 μm to 10.4 μm 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 μm). 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.enAttribution-NonCommercial-ShareAlike 3.0 United StatesBaGa4Se7nonlinear chalcogenideoptical parametric oscillatorOPOmid-infraredmid-IRResearch Subject Categories::NATURAL SCIENCES::Physics::Other physics::OpticsResearch Subject Categories::TECHNOLOGY::Engineering physics::Optical physicsArticle