Growth and properties of LiGaX<SUB>2</SUB> (X = S, Se, Te) single crystals for nonlinear optical applications in the mid-IR by L. Isaenko, A. Yelisseyev, S. Lobanov, A. Titov, V. Petrov, J.-J.Zondy, P. Krinitsin, A. Merkulov, V. Vedenyapin, J. Smirnova

Crystal Research and Technology

Cryst. Res. Technol. 38, 379 (2003) - Abstract -

Growth and properties of LiGaX₂ (X = S, Se, Te) single crystals for nonlinear optical applications in the mid-IR

L. Isaenko, A. Yelisseyev, S. Lobanov, A. Titov, V. Petrov*, J.-J.Zondy**, P. Krinitsin, A. Merkulov, V. Vedenyapin, J. Smirnova

Design & Technological Institute of Monocrystals, 43 Russkaya str., Novosibirsk 630058, Russia
*Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Strasse, D-12489 Berlin, Germany
**BNM-LPTF, Observatory of Paris, 61 Av. de l’Observatoire, F-75014 Paris, France

Keywords crystal growth, light absorption, refractive indices, phase-matching, Li-containing ternary compounds

Single crystals LiGaX₂ (X = S, Se, Te) of optical quality were grown, with transparency ranges at 5 cm^-1 absorption level of 0.32-11.6 μm, 0.37-13.2 μm and 0.54-14.2 μm, respectively. The first two, LiGaS₂ and LiGaSe₂, have a wurtzite-type structure whereas LiGaTe₂ is tetragonal (chalcopyrite lattice). The three refractive indices were measured in the whole transparency ranges of LiGaS₂ and LiGaSe₂ and na and nc were found to be very close (quasi-uniaxial optical anisotropy) with a crosspoint at 6.5 μm (LiGaS₂) and 8 μm (LiGaSe₂). Sellmeier equations were fitted and phase-matching conditions for second harmonic generation (SHG) were calculated: the 1.467-11.72 μm spectral range for the fundamental is covered by LiGaS₂ and LiGaSe₂.

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