Abstract

Mid-infrared (MIR) nonlinear optical crystals of ${\mathrm{LiInSe}}_2$ (LISe) were grown by a modified Bridgman technique on a (001)-seed. A 7–12 μm widely tunable picosecond (ps) MIR optical parametric amplifier (OPA) based on a LISe crystal was demonstrated for the first time, to the best of our knowledge. The MIR OPA was pumped by a 30 ps 1064 nm Nd:YAG laser and injected by a ${\mathrm{KTiOPO}}_4$ (KTP)-based widely tunable near-infrared seed. The idler operating at 7.5 μm with the highest pulse energy of 170 μJ was obtained under a pump energy of 14 mJ. The corresponding energy conversion efficiency is $\sim 1.21\%$, and the photon conversion efficiency is 8.6%. The output energies were measured to be $\sim 121\mathbf{\mu J}$ at 7 μm and $\sim 21\mathrm{\mu J}$ at 12 μm.

© 2017 Optical Society of America

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