We report performance studies of high-power, continuous-wave (cw), mid-infrared (mid-IR) difference-frequency generation (DFG) in MgO:PPLN at 2262 nm based on a narrowband Yb-fiber laser as pump and Tm-fiber signal source. Using 50-mm-long crystal, we generate much 3.84 W DFG output power single-pass conversion efficiency up to 0.57%/W, with passive stability better than 0.53% rms spectral 0.01...
