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Growth and properties of LiGaX 2 (X = S, Se, Te) single crystals for nonlinear optical applications in the mid‐IR
Author(s) -
Isaenko L.,
Yelisseyev A.,
Lobanov S.,
Titov A.,
Petrov V.,
Zondy J.J.,
Krinitsin P.,
Merkulov A.,
Vedenyapin V.,
Smirnova J.
Publication year - 2003
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310047
Subject(s) - tetragonal crystal system , wurtzite crystal structure , second harmonic generation , nonlinear optical , anisotropy , nonlinear optics , refractive index , chemistry , materials science , crystallography , optics , analytical chemistry (journal) , optoelectronics , crystal structure , nonlinear system , physics , laser , quantum mechanics , chromatography , hexagonal crystal system
Single crystals LiGaX 2 (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, LiGaS 2 and LiGaSe 2 , have a wurtzite‐type structure whereas LiGaTe 2 is tetragonal (chalcopyrite lattice). The three refractive indices were measured in the whole transparency ranges of LiGaS 2 and LiGaSe 2 and n a and n c were found to be very close (quasi‐uniaxial optical anisotropy) with a crosspoint at 6.5 μm (LiGaS 2 ) and 8 μm (LiGaSe 2 ). 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 LiGaS 2 and LiGaSe 2 .
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