高功率宽带可调谐全固态CW PPMgLN光学参量振荡器

A high-power and broadly-tunable all-solid-state CW optical parametric oscillator based on PPMgLN

利用输出1 064nm波长的全固态连续Nd:YVO4激光器作为泵浦源,采用周期极化晶体的周期调谐技术,对周期极化MgO:LiNO3(PPMgLN)晶体准相位匹配全固态连续波(CW)光学参量振荡器(OPO)的高功率宽波段调谐输出特性进行了研究,实现了连续模式的全固态OPO在近红外和中红外波段高功率宽带可调谐输出。实验采用连续工作模式、单谐振和外腔结构。实验结果表明,全固态CW PPMgLN OPO实现了信号光在1 435.9～1 670.2nm近红外波段和闲频光在2 970.4～4 185.0nm中红外波段宽带可调谐输出;在30.5μm周期处的泵浦功率达到11.8 W时获得最大总输出功率为4.2W,信号光在1548nm处和闲频光在3451nm处的功率分别达到2.2和2.0W,相应的光-光转换效率分别为35.6、18.6和16.9%。CW PPMgLN OPO输出功率的稳定性达到9.88%。

The output characteristics of a multi-wavelength tunable optical parametric oscillator （OPO） which is pumped by an albsolid state Nd： YVO4 laser with the 1 064 nm wavelength are investigated by quasi-phase-matching period tuning technology. The experiment is carried out by using the external cavi ty structure, singly resonant optical parametric oscillator and continuous wave （CW） operation mode based on the periodically poled MgO： LiNO3 （PPMgLN） crystal. Experimental results indicate that the broadly tunable near-infrared spectrum from 1 435.9 nm to 1 670.2 nm and the mid-infrared spectrum from 2 970.4 nm to 4 185.0 nm are obtained. The maximum total signal and idler output power,signal and idler output power at 30. 5μm poling period are 4.2 W,2.2 W and 2 W,respectively,corresponding to opticaboptical efficiencies of 35.6%, 18. 6% and 16.9%, respectively. The output power stability of CW PPMgLN OPO is up to 9. 88%. Therefore, a high-power broadly-tunable all-solid state CW PPMgLN OPO in the neapinfrared and mid-infrared regions is realized.