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Crystals 2016, 6(8), 85; doi:10.3390/cryst6080085

Properties of LiGa0.5In0.5Se2: A Quaternary Chalcogenide Crystal for Nonlinear Optical Applications in the Mid-IR

1
Laboratory of Crystal Growth, Institute of Geology and Mineralogy, SB RAS, 3 Ac. Koptyuga Ave., 630090 Novosibirsk, Russia
2
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia
3
Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Ning Ye
Received: 22 June 2016 / Revised: 19 July 2016 / Accepted: 22 July 2016 / Published: 28 July 2016
(This article belongs to the Special Issue Nonlinear Optical Crystals)
View Full-Text   |   Download PDF [2298 KB, uploaded 28 July 2016]   |  

Abstract

LiGaSe2 (LGSe) and LiInSe2 (LISe) are wide band-gap nonlinear crystals transparent in the mid-IR spectral range. LiGa0.5In0.5Se2 (LGISe) is a new mixed crystal, a solid solution in the system LGSe–LISe, which exhibits the same orthorhombic structure (mm2) as the parent compounds in the same time being more technological with regard to the growth process. In comparison with LGSe and LISe its homogeneity range is broader in the phase diagram. About 10% of the Li ions in LGISe occupy octahedral positions (octapores) with coordination number of 3. The band-gap of LGISe is estimated to be 2.94 eV at room temperature and 3.04 eV at 80 K. The transparency at the 0-level extends from 0.47 to 13 µm. LGISe crystals exhibit luminescence in broad bands centered near 1.7 and 1.25 eV which is excited most effectively by band-to-band transition. From the measured principal refractive indices and the fitted Sellmeier equations second-harmonic generation from 1.75 to 11.8 μm (fundamental wavelength) is predicted. The nonlinear coefficients of LGISe have values between those of LGSe and LISe. 6LGISe crystals are considered promising also for detection of thermal neutrons. View Full-Text
Keywords: nonlinear optical crystals; ternary and quaternary chalcogenides; solid solution; mid-IR nonlinear optical crystals; ternary and quaternary chalcogenides; solid solution; mid-IR
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Isaenko, L.; Yelisseyev, A.; Lobanov, S.; Vedenyapin, V.; Krinitsyn, P.; Petrov, V. Properties of LiGa0.5In0.5Se2: A Quaternary Chalcogenide Crystal for Nonlinear Optical Applications in the Mid-IR. Crystals 2016, 6, 85.

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