Nonlinear optical crystals LGS (LiGaS2),
LGSe(LiGaSe2), LGT (LiGaTe2)
NEW
Main properties
Compound LiGaS2 LiGaSe2 LiGaTe2
Transparency range, µm 0.33 - 12 0.38 - 14 0.52 - 15
Symmetry mm2 mm2 42m
Band gap, eV (300K) 4.15 3.34 2.31
Nonlinear susceptibility, pm/V
(at 2.3 µm)		 d31=5.8;
d24=5.1;
d33= -10.7		 d31=9.9;
d24=7.7;
d33= -18.2		 d36=43±10%
Absorption edge in the far-IR on 0.2
transparency level		 µm 92 218 -
THz 3.25 1.37 -
Application
LGS and LGSe are a very recently proposed IR new nonlinear materials with a wurtzite-type structure and UV transmission down to 0.32, 0.38 µm respectively.
LGT - most effective material of LBC2 crystal group with chalcopyrite structure - is a subject for joint investigations and collaboration.

Crystals of LiBC2 group are characterised by a set of important physical parameters, such as large band gap, low two photon absorption, wide transparency range, including THz window, low group velocity mismatch, high thermal conductivity, low anisotropy of thermal expansion coefficient, etc. which lead to effective use in tunable laser systems in wide spectral range.
Publications
  1. L. Isaenko, A. Yelisseyev, S. Lobanov, A. Titov, P. Krinitsin, V. Vedenyapin, J. Smirnova, Growth and properties of LiGaX2 (X=S,Se,Te) single crystals for nonlinear application in the mid-IR, ICSSC-2002 conf. in Zakopane, October 2002, 8 pages manusript was submitted to Proc. SPIE . and Crystal Research and Technology, v.38, N 3-5 (2003) 379-387.

  2. L. Isaenko, A. Yelisseyev, S. Lobanov, A. Titov, P. Krinitsin, V. Petrov, J.-J. Zondy, "LiGaX2 (X=S, Se, Te): new nonlinear crystals for the mid-IR", Conference on Lasers and Electro-Optics CLEO'03, Baltimore (Maryland), USA, June 1-6, 2003, paper CWA15.

  3. V. Petrov, A. Yelisseyev, L. Isaenko, S. Lobanov, A. Titov, J.-J. Zondy, Second harmonic generation and optical parametric amplification in the mid-IR with orthorhombic biaxial crystals LiGaS2 and LiGaSe2, Applied Physics B, 78 (2004) pp. 543-546.

  4. L. Isaenko , I. Vasilyeva, A. Merkulov, A. Yelisseyev, S.Lobanov, Growth of new nonlinear crystals LiMeX2 (M=Al, In, Ga; X=S, Se, Te) for the mid-IR optics, J. Cryst. Growth 275(2005) 217-223

  5. L. Isaenko, P. Krinitsin, V. Vedenyapin, A. Yelisseyev, A. Merkulov, J.-J. Zondy and V. Petrov. LiGaTe2: A New Highly Nonlinear Chalcopyrite Optical Crystal for the Mid-IR. Journal Crystal Growth & Design 2005, Vol. 5, NO. 4, P. 1325 - 1329

  6. J.-J. Zondy, V. Vedenyapin, A. Yelisseyev, S. Lobanov, L. Isaenko, V. Petrov, LiInSe2 nanosecond optical parametric oscillator, Optics Letters v.30, N18 (2005) 2460-2462.

  7. W.Chen, E.Poullet, J.Burie, D.Boucher. Markus W.Sigrist, J.-J.Zondy, L.Isaenko, A.Yelisseyev, S.Lobanov, Widely tunable continious- wave mid-IR radiation (5.5-11 µm) by difference frequency generation in LiInS2 crystal, Applied Optics, v.44, No 19 (2005) 4123-4129.

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