A watt-level, single-frequency, continuous-wave (cw) singly resonant optical parametric oscillator (OPO) based on is described. Pumped in the green by a frequency-doubled cw diode-pumped laser at , the OPO can provide up to of single-frequency idler output with a linewidth of at pump depletions of as much as 67%. Using a compact ring resonator and optimized focusing in a crystal, a singly resonant oscillation threshold of has been obtained under single-pass pumping. With a single grating period of , continuous signal and idler coverage over is obtained by temperature tuning between 61°C and 236°C. The influence of thermal lensing on idler output power across the SRO tuning range is also verified.
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