Optical, vibrational, thermal, electrical, damage, and phase-matching properties of lithium thioindate
Résumé
Lithium thioindate (LiInS2) is a new nonlinear chalcogenide biaxial material transparent from 0.4 to 12 mum that has been successfully grown in large sizes and with good optical quality. We report on new physical properties that are relevant for laser and nonlinear optics applications. With respect to AgGaS(e)2 ternary chalcopyrite materials, LiInS2 displays a nearly isotropic thermal expansion behavior, a 5-times-larger thermal conductivity associated with high optical damage thresholds, and an extremely low-intensity-dependent absorption, allowing direct high-power downconversion from the near-IR to the deep mid-IR. Continuous-wave difference-frequency generation (5-11 mum) of Ti:sapphire laser sources is reported for the first time to our knowledge.
Mots clés
lithium compounds
Raman spectra
optical materials
semiconductor materials
optical phase matching
transparency
thermal expansion
thermal conductivity
laser beam effects
infrared spectra
optical frequency conversion
titanium
solid lasers
thermo-optical effects
electro-optical effects
vibrations
Physics - Optics