CONTINUOUS-WAVE TUNABLE LIGHT-SOURCE AT 1.6 MU-M BY DIFFERENCE-FREQUENCY MIXING IN CSTIOASO4

We report the generation of tunable cw radiation at 1.6 mu m by differ ence-frequency mixing in a type II phase-matched 90 degrees-cut CsTiOA sO4 crystal, using a Kr-ion laser at 531 nm and a tunable Ti:sapphire laser as the input light sources. The output was tunable from 1.57 to 1.65 mu m with a single-pass output power of 1 mu W. We used doubly re sonant external-cavity enhancement to generate 100 mu W Of output powe r by placing the crystal inside an optical cavity that was resonant at the frequencies of the input Ti:sapphire laser and the 1.6-mu m outpu t light. (C) 1995 Optical Society of America