Abstract

Phase-matched second-harmonic generation is obtained in various LiInS2 crystals by use of the tunable picosecond output of the free-electron laser for infrared experiments (FELIX) as the pump source in the mid-IR range from 2.75 to 6.0 μm. Deviations from the phase-matching curve calculated from Boyd’s refractive-index data are observed. Furthermore, the optical damage threshold of the crystals has been measured to be 1.1. J/cm2 >6 GW/cm2 at the 5μm wavelength. LiInS2 holds great promise for parametric interaction in the 113μm range.

© 2001 Optical Society of America

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