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An all-solid-state mid-infrared optical parametric oscillator with wide tunability by using two identical multi-grating periodically poled 5-mol.-% MgO-doped lithium niobate cascaded is reported.The pump laser is an acousto-optically Q-switched Nd:YAG laser with 150-ns pulse width at repetition rate of 10 kHz.Wide tunability from 2.789 to 4.957 μm at the idler wavelength is achieved by varying the temperature from 40 to 200°C and translating the grating periods from 26 to 31 μm with a step of 0.5 μm.When the incident pump average power is 8.15 W,the maximum idler output average power is 2.23 W at 3.344 μm and the optic-optic conversion e?iciency is about 27.4%.
An all-solid-state mid-infrared optical parametric oscillator with wide tunability by using two identical multi-grating periodically poled 5-mol .-% MgO-doped lithium niobate cascaded is reported. The pump laser is an acousto-optically Q-switched Nd: YAG laser with 150-ns pulse width at repetition rate of 10 kHz. Width tunability from 2.789 to 4.957 μm at the idler wavelength is achieved by varying the temperature from 40 to 200 ° C and translating the grating periods from 26 to 31 μm with a step of 0.5 μm .When the incident pump average power is 8.15 W, the maximum idler output average power is 2.23 W at 3.344 μm and the optic-optic conversion e · iciency is about 27.4%.