High-power mid-infrared pulse MgO:PPLN optical parametric oscillator pumped by linearly polarized Yb-doped all-fiber laser

•An all-fiber-laser pumped high-power mid-infrared (MIR) MgO:PPLN optical parametric oscillator (OPO) is built.•Pump repetition rate, pulse width, and waist diameter are optimized to improve the MIR output power.•A maximum mid-infrared (MIR) power of 10.82 W at 3.754 µm is obtained with the conversion efficiency of 13.68%•The corresponding maximum total output power is 35.4 W with a conversion efficiency of 44.75%. We present a MgO:PPLN-based optical parametric oscillator (OPO) pumped by all-fiber Yb-doped fiber laser (YDFL). The performances of the linearly polarized YDFL are first investigated. A maximum power of 79.1 W at 1064.1 nm is obtained with the repetition rate of 300 kHz and pulse width of 200 ns. Then we examine the dependence of OPO characteristics on the pump repetition rate, pulse width, and waist diameter. By optimizing these factors, we report a maximum mid-infrared (MIR) power of 10.82 W at 3.754 µm with the conversion efficiency of 13.68%. The corresponding total output power reaches 35.4 W.