Abstract
A multi-grating periodically poled LiNbO3 (PPLN) doubly resonantoptical parametric oscillator (DROPO) pumped by a 2-μm laser isdemonstrated experimentally. Employing acousto-optically Q-switchedTm,Ho:GdVO4 laser with pump pulse of 25 ns and repetition rate of10 kHz as pump sources firstly, the noncritically quasi-phase-matched(QPM) tunable mid-IR output in 3.87–4.43 μm is produced. Wavelengthtuning is achieved with crystal temperature tuning from50–180°C. When the incident average pump power is 3 W at2.048 μm, the total OPO output power of 195 mW at wavelength3.88 μm is obtained, corresponding to optical-to-optical conversionefficiency up to 6.5%.
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