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

✍ Scribed by L. Isaenko; A. Yelisseyev; S. Lobanov; A. Titov; V. Petrov; J.-J. Zondy; P. Krinitsin; A. Merkulov; V. Vedenyapin; J. Smirnova

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 281 KB
• Volume: 38
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200310047

✦ Synopsis

Abstract

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~.