Tunable Multiple-channel optical parametric oscillator in atmospheric transmission window

We report a compact all-solid-state mid-infrared optical parametric oscillator with wide tenability using periodically poled 5 mol % MgO-doped LiNbO₃ with a multiple-channel structure design and pumped by a compact diode-pump solid-state laser operating at 1.064 μm. Wide tunability from 1.44 to 1.58 μm at the signal beam wavelength and from 3.28 to 4.11 μm at the idler beam wavelength was achieved by both varying the temperature and translating the crystal through the resonator and the pump beam with no realignment required. The tuning range is in the atmospheric transmission window.