763-nm Laser Light Source for Oxygen Monitoring Using Second Harmonic Generation in Direct-Bonded Quasi-Phase-Matched LiNbO3 Ridge Waveguide

We fabricate a 763-nm laser module based on second-harmonic generation using a direct-bonded quasi-phase-matched LiNbO 3 ridge waveguide. We obtained a 0.84-mW output of 763 nm light using a 1526-nm distributed-feedback laser diode. We also demonstrate O 2 gas detection using the module output.