基于GaSe差频产生8～19μm可调中红外辐射

利用Nd:YAG激光器抽运内腔KTP光学参量振荡器,得到了输出为2μm附近的双波长,并在满足Ι类相位匹配条件下,在GaSe中共线差频产生8～19μm连续宽调谐调的中红外辐射.在8.76μm处脉冲最大能量达33.66μJ,峰值功率7.4kW,光子转换效率达4.43%左右.分析了影响能量转化效率的原因,提出了补偿走离的措施.     

Low Threshold and High Conversion Efficiency Nanosecond Mid-Infrared KTA OPO

Based on a Type II non-critically phase-matched KTA crystal, a low-threshold and high conversion efficiency mid-infrared optical parametric oscillator （OPO） pumped by a diode-end-pumped Nd：YVO4 laser is demonstrated. The OPO threshold is only 0.825W. The maximum output power of 435mW at 3.47μm is achieved with the repetition rate of 30kHz, corresponding to an optical-to-optical conversion efficiency of 4.4%. The photon conversion efficiency is as high as about 64%. The pulse width is 3.5ns with a peak power of 4kW for the maximum output power.     

基于GaSe差频产生8~19 μm可调中红外辐射

利用Nd∶YAG激光器抽运内腔KTP光学参量振荡器,得到了输出为2 μm附近的双波长,并在满足Ι类相位匹配条件下,在GaSe中共线差频产生8~19 μm连续宽调谐调的中红外辐射.在8.76 μm处脉冲最大能量达33.66 μJ,峰值功率7.4 kW,光子转换效率达4.43%左右.分析了影响能量转化效率的原因,提出了补偿走离的措施.