Journal
CRYSTAL RESEARCH AND TECHNOLOGY
Volume 38, Issue 3-5, Pages 379-387Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/crat.200310047
Keywords
crystal growth; light absorption; refractive indices; phase-matching; Li-containing ternary compounds
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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 mum, 0.37-13.2 mum and 0.54-14.2 mum, 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 n(a) and n(c) were found to be very close (quasi-uniaxial optical anisotropy) with a crosspoint at 6.5 mum (LiGaS2) and 8 mum (LiGaSe2). Sellmeier equations were fitted and phase-matching conditions for second harmonic generation (SHG) were calculated: the 1.467-11.72 mum spectral range for the fundamental is covered by LiGaS2 and LiGaSe2.
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