New mixed LiGa0.5In0.5Se2 nonlinear crystal for the mid-IR

Vitaliy Vedenyapin; Ludmila Isaenko; Alexander Yelisseyev; Sergei Lobanov; Aleksey Tyazhev; Georgi Marchev; Valentin Petrov

doi:10.1117/12.874504

21 February 2011 New mixed LiGa_0.5In_0.5Se₂ nonlinear crystal for the mid-IR

Vitaliy Vedenyapin, Ludmila Isaenko, Alexander Yelisseyev, Sergei Lobanov, Aleksey Tyazhev, Georgi Marchev, Valentin Petrov

Author Affiliations +

Proceedings Volume 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X; 79171L (2011) https://doi.org/10.1117/12.874504
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

LiGaSe₂ and LiInSe₂ are promising nonlinear crystals for conversion of laser radiation to the mid-IR spectral range which are transparent down to the visible and UV. We successfully grew a new mixed crystal as a solid solution in the system LiGaSe₂ - LiInSe₂, with a composition of LiGa_0.5In_0.5Se₂ which has the same orthorhombic structure (mm2) as the parent compounds (LiGaSe₂ and LiInSe₂). The new crystal is more technological with regard to the growth process in comparison with LiGaSe₂ and LiInSe₂ since its homogeneity range is broader in the phase diagram. We established that about 10% of the Li ions are found in octahedral position with coordination number of 3. The band-gap of LiGa_0.5In_0.5Se₂ is estimated to be 2.94 eV at room temperature. The transparency at the 0-level extends from 0.47 to 13 μm. The dispersion of the principal refractive indices was measured and Sellmeier equations were constructed. The fundamental wavelength range for the SHG process extends from 1.75 to 11.8 μm. The nonlinear coefficients of LiGa_0.5In_0.5Se₂ have values between those of LiGaSe₂ and LiInSe₂.

Citation Download Citation

Vitaliy Vedenyapin, Ludmila Isaenko, Alexander Yelisseyev, Sergei Lobanov, Aleksey Tyazhev, Georgi Marchev, and Valentin Petrov "New mixed LiGa_0.5In_0.5Se₂ nonlinear crystal for the mid-IR", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79171L (21 February 2011); https://doi.org/10.1117/12.874504

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