BARIUM SELENOGALLATE BaGa4Se7 (BGSe)

Chemical formula: BaGa4Se7
Symmetry: Pc
Density (g/cm3): 5.16
Transparency range (μm): 0.47 – 18
Optical damage threshold (MW/cm2): >250 (1064 nm, 10 ns)
Refractive index: nx – 2.48615, ny – 2.50245, nz – 2.55872 (1064.2 nm)
Nonlinear coefficients (pm/V): d11 = 18.2, d13 = -20.6
Surface quality: 30/20 (scratch/dig)
Flatness: λ/4 (546 nm)
Parallelism: < 40”

1. A.P. Yelisseyev, S.I. Lobanov, P.G. Krinitsin, L.I. Isaenko. The optical properties of the nonlinear crystal BaGa4Se7. Optical Materials 99 (2020) 109564.
https://doi.org/10.1016/j.optmat.2019.109564

2. Michal Jelínek, Václav Kubeček, Ondřej Novák, Jaroslav Huynh, Martin Cimrman, Michal Chyla, Martin Smrž, Tomáš Mocek, Sergei N. Smetanin, Sergei G. Grechin, Pavel G. Krinitsin, Aleksey F. Kurus’, Lyudmila I. Isaenko. Difference Frequency Generation in BaGa4Se7 Tunable in a 6.5-8.5 μm Range with a Peak Power of 30 MW Pumped by 1.03 μm, 1.8 ps Laser. Technical Digest Series (Optica Publishing Group, 2022), paper JTh4A.15.
https://doi.org/10.1364/EUVXRAY.2022.JTh4A.15

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