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We built a 1-watt cw singly resonant optical parametric oscillator operatingat an idler wavelength of 1.65~$\mu$m for application to quantum interfaces.The non resonant idler is frequency stabilized by side-fringe locking on arelatively high-finesse Fabry-Perot cavity, and the influence of intensitynoise is carefully analyzed. A relative linewidth down to the sub-kHz level(about 30 Hz over 2 s) is achieved. A very good long term stability is obtainedfor both frequency and intensity.

30-Hz relative linewidth watt output power 1.65-$\mu$m continuous-wave singly resonant optical parametric oscillator