LiInS(2): A new nonlinear crystal for the mid-IR

Abstract

Second harmonic generation for fundamental wavelengths between 2.3 and 6 mum and optical parametric generation from 5 to 12mum in the mid-IR are demonstrated in a new nonlinear crystal, LiInS(2), exhibiting no two-photon absorption near 800 nm. Photoinduced absorption in the visible to near-IR occurring at lambda < 450 nm excitation can be removed with illumination at lambda < 500 nm or minimized by annealing in In(2)S(3) vapor. (C) 2002 Published by Elsevier Science Ltd