Abstract
Mid-infrared optical parametric oscillators based on multigrating and fan-out periodically poled MgO-doped LiNbO3 (PPMgO:LN) crystals pumped with a repetitively pulsed Tm3+:Lu2O3-ceramics laser at 1966 nm were experimentally studied. The 983-nm wavelength second-harmonic generation of the pumping beam was found to be competing with the parametric oscillations in PPMgO:LN crystals. Double-resonant optical parametric oscillations near the degeneracy point at 3.93 μm were observed in multigrating PPMgO:LN crystal, but were not detected in the fan-out PPMgO:LN structure due to pump-power depletion by second-harmonic generation. Efficient second-harmonic generation with an average power up to 4.66 W at 983 nm was achieved in the fan-out PPMgO:LN crystal.
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