We report the demonstration of a cw AgGaS2 optical parametric oscillator (OPO). The subharmonic (3ω → 2ω + ω) OPO is configured as a doubly resonant oscillator with weak pump enhancement. The temperature-tuned, noncritically phase-matched crystal is pumped by a diode laser at λp ≈ 845 nm. Oscillation at λs ≈ 1267 nm and λi ≈ 2535 nm is observed at an input threshold power of 60 mW. Crystal thermal loading induces a robust passive self-frequency stabilization of any single-axial-mode pair to the OPO cavity resonance. The conversion efficiency is limited by thermal effects to 2% for a 200-mW pump input.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics