Generation of widely tunable mid-infrared radiation by difference frequency mixing in KTP

Abstract

The crystal potassium titanyl phosphate (KTP) shows promise for generation of tunable infrared radiations throughout the range 2-4.5 μm. Widely tunable mid-infrared radiations have been generated by nonlinear difference frequency mixing of the Nd:YAG second harmonic and the same pumped tunable dye laser radiation (610-710 nm) in a KTP crystal. The system generates more than 14 W mid-infrared peak power at 3.27 μm by difference frequency generation.