A fiber laser pumped dual-wavelength mid-infrared optical parametric oscillator based on aperiodically poled magnesium oxide doped lithium niobate

Abstract

We report a fiber laser pumped dual-wavelength mid-infrared optical parameter oscillator (OPO) based on an aperiodic optical superlattice (AOS) structure. An aperiodically poled MgO-doped lithium niobate wafer was designed and fabricated as the nonlinear crystal for the OPO. Using a linearly polarized pulsed Yb fiber laser at 1.064 μm as the pump source, mid-infrared emissions at 3.3 and 3.8 μm were obtained simultaneously from the OPO. The total output power at the idler wavelengths of 3.3 and 3.8 μm reached 3.07 W under the maximum pump power of 27 W. The pump-to-idler conversion efficiency was 11.4% with a ratio of about 1.2:1 for 3.3 μm and 3.8 μm.