可调谐Nd:YVO 4 /MgO:PPLN连续中红外光学参量振荡器

An efficient tunable,continuous-wave,mid-infrared,intra-cavity singly resonant Nd∶YVO4/MgO∶PPLN optical parametric oscillator is presented.A laser-diode-pumped 1 064nm laser is taken as the incident light and a MgO∶PPLN crystal is used for frequency conversion.The variation of the mid-infrared output wavelength with the grating period and temperature of nonliear crystal is investigated.The grating period of multi-grating MgO∶PPLN chip is from29.52 to 31.59μm by a step of 0.5mm.The tuning wavelength of the signal light is from 1.48 to 1.63μm and that of the idle light is 3.0 to 3.8μm.A maximum signal power of 760mW and idler power of 360 mW are obtained under a pump power of 8.06 W at 808 nm,with corresponding to a total optical efficiency being 13.9% when the grating period is 30.5μm.