Л. И. Исаенко1, Alexander Yèlisseyev2, S. Lobanov1, Aleksei Titov1, Valentin Petrov3, J.‐J. Zondy4, P. Krinitsin1, A. Merkulov1, Vitaliy Vedenyapin1, Julia Smirnova1
1Design & Technological Institute of Monocrystals, 43 Russkaya str., Novosibirsk 630058, Russia
2RAS - Sobolev Institute of Geology and Mineralogy, Siberian Branch
3Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Strasse, D-12489 Berlin, Germany
4BNM-LPTF, Observatory of Paris, 61 Av. de l'Observatoire, F-75014 Paris, France
Tóm tắt
AbstractSingle 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.
