Department of Optical Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China.
Opt Lett. 2011 Mar 15;36(6):921-3. doi: 10.1364/OL.36.000921.
We experimentally demonstrated an efficient optical parametric oscillator (OPO) with high parametric conversion from 1.0645 to 3.8 μm. An aperiodically poled magnesium oxide doped lithium niobate wafer was designed and fabricated as the nonlinear crystal of the OPO. A linearly polarized acousto-optic Q-switched Nd:YVO4 laser was used as the pump source. High pump-to-idler conversion efficiency of 18.5% was achieved with a slope efficiency of up to 21.5%. When compared with a periodically poled channel fabricated on the same wafer, under the condition of output coupler optimized for the periodically poled lithium niobate based OPO, an improvement of slope efficiency by 28.3% from 15.2% to 19.5% and total efficiency by 12.5% from 13.6% to 15.3% under the highest pump power of 11 W was realized for the pump-to-idler conversion.
我们实验演示了一种高效的光学参量振荡器（OPO），其从 1.0645μm 到 3.8μm 的参量转换效率很高。设计并制造了一种非周期性极化掺镁铌酸锂晶圆作为 OPO 的非线性晶体。线性偏振声光调 Q Nd:YVO4 激光器用作泵浦源。当与同一晶圆上制造的周期性极化通道进行比较时，在针对基于周期性极化铌酸锂的 OPO 优化输出耦合器的条件下，在 11W 的最高泵浦功率下，从 15.2%提高到 19.5%，实现了斜率效率提高 28.3%，从 13.6%提高到 15.3%，用于泵浦到闲频光的转换。
