介绍了一种光纤激光泵浦的三波长中红外光参量振荡器。在最大泵浦功率70.7 W, 泵浦波长为1 060、1 065、1 080 nm的情况下, 实现了8.7 W的中红外闲频光输出, 斜效率达到16%, 闲频光三个波长分别为3 132、3 170、3 310 nm, 但产生的信号光只有一个波长为1 604 nm。对实验结果进行了理论分析和实验测试, 得出在谐振腔内1 060 nm泵浦光发生了光参量振荡, 而1 065、1 080 nm泵浦光分别与1 604 nm信号光发生了差频过程, 同时还利用差频转换效率理论对1 065 、1 080 nm差频产生的闲频光强度的差异进行了分析和解释。

A fiber laser pumped three-wavelength mid-infrared optical parametric oscillator was demonstrated. The pump source had three wavelengths which were 1 060 nm, 1 065 nm and 1 080 nm and the maximum pump power was 70.7 W. 8.7 W mid-infrared idler output was achieved under the maximum pump power, indicating a 16% slope efficiency. The idler wave had three wavelengths which were 3 132 nm, 3 170 nm and 3 310 nm but the signal wave just had one wavelength locating at 1 604 nm. The experiment result was analyzed in both theory and experiment, and came to a conclusion that in the optical resonator, the optical parametric oscillation happened to the 1 060 nm pump wave and the difference frequency generation happened between the 1 604 nm signal wave and the 1 065 nm, 1 080 nm pump waves separately. The intensity difference between idler waves generated by the difference frequency generation of 1 065 nm and 1 080 nm was also analyzed using the conversion efficiency theory of difference frequency generation.