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A doubly resonant ZnGeP_2(ZGP)optical parametric oscillator(OPO)pumped by a novel Tm.Ho:GdVO_4 laser was demonstrated.Cryogenic Tm(5 at.-%),Ho(0.5 at.-%):GdVO_4 laser with high pulse repetition frequency(PRF)of 10 kHz at 2.05μm was employed as pumping source of ZGP OPO.The 15-mm-long ZGP crystal,55°cut forⅠ-type phase-matching with low absorption coefficient less than 0.05 cm~(-1)at 2 #m, was placed in a plano-plano cavity with resonator length of 30 mm.The ZGP OPO generated a total combined output power of 1.2 W at 3.75 and 4.52μm under pumping power of 5.3 W,corresponding to slope efficiency of 40% from incident 2-μm laser power to mid-infrared(Mid-IR)output.A widely tunable range from 3.0 to 6.5μm was achieved by changing the crystal angle only 3.5°.
GdVO_4 laser was demonstrated. Cryogenic Tm (5 at .-%), Ho (0.5 at .-%): GdVO_4 laser with high pulse (ZGP) pumped by a novel Tm.Ho: repetition frequency (PRF) of 10 kHz at 2.05 μm was employed as pumping source of ZGP OPO. The 15-mm-long ZGP crystal, 55 ° cut for Ⅰ-type phase-matching with low absorption coefficient less than 0.05 cm -1 ) at 2 #m, was placed in a plano-plano cavity with resonator length of 30 mm. ZGP OPO generated a total combined output power of 1.2 W at 3.75 and 4.52 μm under pumping power of 5.3 W, corresponding to slope efficiency of 40% from incident 2-μm laser power to mid-infrared (Mid-IR) output. A wide tunable range from 3.0 to 6.5 μm was achieved by changing the crystal angle only 3.5 °.