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We demonstrate a compact continuous-wave single-frequency doubly-resonantoptical parametric oscillator (DRO) in a double-pass pump configuration with acontrol of the relative phase between the reflected waves. The nested DROcavity allows single longitudinal mode operation together with low thresholdand high efficiency. Thermal effects are managed by chopping the pump beam,allowing continuous tuning of the emitted wavelength. The infrared idler wave(3200-3800 nm) can be used for gas detection and the threshold pump power iscompatible with diode pumping.

Compact infrared continuous-wave double-pass single-frequency doubly-resonant OPO