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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isaenko L. I., Yelisseyev A. P., Lobanov S. I., Krinitsin P. G., Molokeev M. S.
Заглавие : Structure and optical properties of Li2Ga2GeS6 nonlinear crystal
Коллективы : Russian Foundation of Basic Research [15-02-03408a]
Место публикации : Opt. Mater.: Elsevier Science, 2015. - Vol. 47. - P.413-419. - ISSN 0925-3467, DOI 10.1016/j.optmat.2015.06.014
Примечания : Cited References:23. - This work was supported by the Russian Foundation of Basic Research (Grant No. 15-02-03408a)
Предметные рубрики: PHASE-MATCHING PROPERTIES
MID-IR
PARAMETRIC AMPLIFICATION
GENERATION
LiGaS2
GROWTH
DAMAGE
Ga
Te
Se
Ключевые слова (''Своб.индексиров.''): li2ga2ges6--structure--absorption--raman--luminescence--excitons
Аннотация: Structure and optical properties of new nonlinear crystal - Li2Ga2GeS6 single crystal of optical quality, grown by the Bridgman technique were studied. The data on transmission, Raman scattering, luminescence emission, excitation and thermal quenching as well as thermostimulated luminescence are presented. Fundamental absorption edge is determined by the direct allowed electronic transitions: The values of optical band gap are estimated. Absorption band at 8.0 mu m is due to S-S vibrations. Features in photoluminescence spectra are associated with excitons: both free (narrow line at 371 nm) and self-trapped ones (broad bands at 596, 730 and 906 nm). Spontaneous emission in the 80-170 K range, both at crystal heating and cooling, is typical of pyroelectrics: This confirms the absence of symmetry center in Li2Ga2GeS6 and an opportunity of laser frequency nonlinear conversion. (C) 2015 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krinitsin, Pavel, Yelisseyev, Alexander, Jiang, Xingxing, Isaenko, Lyudmila, Molokeev M. S., Lin, Zheshuai, Pugachev, Alexey
Заглавие : Growth, Structure, and Optical Properties of Nonlinear LiGa0.55In0.45Te2 Single Crystals
Коллективы : Russian Foundation of Basic Research [15-02-03408a, 17-45-540775r_a, 17-52-53031]; national scientific foundations of China [11474292, 51702330, 11611530680, 91622118, 91622124]; special foundation of the director of Technical Institute of Physics and Chemistry (TIPC); China "863" project [2015AA034203]; Youth Innovation Promotion Association, CAS [2017035]; [0330-2016-0008]
Место публикации : Cryst. Growth Des. - 2019. - Vol. 19, Is. 3. - P.1805-1814. - ISSN 1528-7483, DOI 10.1021/acs.cgd.8b01788. - ISSN 1528-7505(eISSN)
Примечания : Cited References: 43. - This work was supported by state assignment project #0330-2016-0008 and partially by the Russian Foundation of Basic Research (Grant Nos. 15-02-03408a, 17-45-540775r_a, and 17-52-53031), national scientific foundations of China (Grant Nos. 11474292, 51702330, 11611530680, 91622118, and 91622124), the special foundation of the director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (No. 2015AA034203) and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and Grant 2017035 for X.J.). Some part of the experiments was performed in the multiple-access center "High-Resolution Spectroscopy of Gases and Condensed Matter" at the IA&E SBRAS (Novosibirsk, Russia). The authors are grateful to N. F. Beisel from the Analytical laboratory of the Nikolaev Institute of Inorganic Chemistry SB RAS for atomic-emission spectral analysis of the studied crystals.
Предметные рубрики: PHASE-MATCHING PROPERTIES
ELECTRONIC-STRUCTURE
MID-IR
Аннотация: In search of new nonlinear optical crystals for the mid-IR range, we grew single crystals of LiGa0.55In0.45Te2 (LGITe) of optical quality; its structure was established, and the spectroscopic properties were studied. LGITe crystallizes in a tetragonal chalcopyrite-like (I4̅2d) structure at 667 ± 5 °C. Crystals are transparent in the 0.76–14.8 μm spectral region with some absorption bands related to OH/H2O and Ge–O vibrations. Analysis of the Tauc plots showed that LGITe is a direct band gap semiconductor with the band gap Eg = 1.837 eV at 300 K. The Raman spectrum for LGITe is very similar to that for LiGaTe2: the most intense band A1 near 120 cm–1 corresponds to the Li–Te vibration. DFT calculations were carried out for the first time to simulate the energy band structure (band gap ∼1.67 eV), density of states (DOS), birefringence (0.049 at 2 μm), and nonlinear susceptibility (d14 = d36 = −48.73 pm/V). For ternary LiInTe2 these parameters are Δn = 0.007 and d14 = d36 = −61.4 pm/V, respectively. The calculated optical properties indicate that LiGa0.55In0.45Te2 is a promising mid-IR nonlinear optical crystal with nonlinear parameters higher than those of LiGaTe2.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kurus, Alexey, Yelisseyev, Alexander, Lobanov, Sergei, Plyusnin, Pavel, Molokeev M. S., Solovyev, Leonid, Samoshkin, Dmitry, Stankus, Sergei, Melnikova S. V., Isaenko, Lyudmila
Заглавие : Thermophysical properties of lithium thiogallate that are important for optical applications
Коллективы : Russian Science Foundation, RussiaRussian Science Foundation (RSF) [19-12-00085]; RFBRRussian Foundation for Basic Research (RFBR) [20-42-543006\20]; Novosibirsk region [20-42-543006\20]
Место публикации : RSC Adv. - 2021. - Vol. 11, Is. 62. - P.39177-39187. - ISSN 2046-2069(eISSN), DOI 10.1039/d1ra05698k
Примечания : Cited References: 41. - Crystal growth and investigation of physical properties were supported by Russian Science Foundation, Russia (#19-12-00085). Spectroscopic study was performed on a state assignment of the Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences Russia and Ministry of Science and Higher Education, Russia. Measurements of thermal conductivity were funded by RFBR and Novosibirsk region (grant #20-42-543006\20)
Предметные рубрики: NON-ENANTIOMORPHOUS CRYSTAL
MID-IR
SINGLE-CRYSTALS
FLASH METHOD
Аннотация: Lithium thiogallate LiGaS2 is one of the most common nonlinear crystals for mid-IR due to its extreme beam strength and wide transparency range; however, its thermophysical properties have not yet been practically studied. Large crystals of high optical quality are grown. DTA revealed features at 1224 K below melting point (1304 K) that are associated with the oxygen containing compounds of the LiGaO2−xSx type. The thermal conductivity of LiGaS2 (about 10.05 W (m−1 K−1)) and band gap value (3.93 eV at 300 K) are found to be the highest in the LiBC2 family. Isotropic points in the dispersion characteristics for the refractive index are found and LiGaS2-based narrow-band optical filters, smoothly tunable with temperature changes, are demonstrated. Intense blue photoluminescence of anionic vacancies VS is observed at room temperature after annealing LiGaS2 in vacuum, whereas orange low-temperature emission is related to self-trapped excitons. When LiGaS2 crystals are heated, spontaneous luminescence (pyroluminescence) takes place, or thermoluminescence after preliminary UV excitation; the parameters of traps of charge carriers are estimated. The obtained data confirm the high optical stability of this material and open up prospects for the creation of new optical devices based on LiGaS2.
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