A single-mode cw optical parametric oscillator (OPO) based on a bulk Bragg grating is reported. The OPO is capable of producing multiwatt output power both at the signal (1535 nm) and idler (3468 nm) wavelengths with a side-mode suppression ratio better than 29 dB. Coarse frequency tuning of 120 GHz (4 cm−1) and fast mode-hop-free tuning of 40 GHz (1.3 cm−1) have been achieved by scanning the grating temperature and the OPO pump laser, respectively.
Vainio, M., Siltanen, M., Hieta, T., & Halonen, L. (2010). Continuous-wave optical parametric oscillator based on a Bragg grating. Optics Letters, 35(10), 1527-1529. https://doi.org/10.1364/OL.35.001527