Mid-infrared tunable dual-wavelength generation based on a quasi-phase-matched optical parametric oscillator

摘要

We report an efficient optical parametric oscillator (OPO) of dual idler wave output based on periodically poled MgO:LiNbO_(3) with a periodically-phase-reversed grating structure, which is pumped by a Q-switched 1.064 (mu)m laser with a repetition rate of 50 kHz. 0.98 W of dual idler-waves at 3.824 (mu)m and 3.731 (mu)m is achieved at room temperature, leading to a 12.9percent conversion efficiency. The crystal temperature tuning provides output tunability of the dual idler wavelengths. In addition, the sum frequency generation of the dual signal waves is simultaneously observed in the OPO cavity.