School of Information Science and Engineering, Shandong University, Jinan, Shandong, China.
Opt Lett. 2011 Mar 15;36(6):813-5. doi: 10.1364/OL.36.000813.
A 1.8 μm optical parametric oscillator (OPO) based on a noncritically phase-matched KTiOPO4 crystal is demonstrated. OPO and stimulated Raman scattering techniques are successfully combined in an acousto-optically Q-switched Nd:YAG/SrWO4 Raman laser. The device efficiently realizes three steps of conversion: from a laser diode wavelength of 808 nm to the fundamental wavelength of 1064 nm; next, to the Stokes wavelength of 1180 nm; and finally to the OPO signal wavelength of 1810 nm. With an incident diode power of 7.2 W and a pulse repetition rate of 15 kHz, an average signal power of 485 mW is obtained with a diode-to-signal conversion efficiency of 6.75%. The beam quality factors (M2) of the signal wave in both horizontal and vertical directions are measured to be 1.7±0.2. The numerical output power results of the system, the thermal lensing, and the stability parameter of the cavity are also discussed.
基于非临界相位匹配的 KTiOPO4 晶体的 1.8μm 光学参量振荡器（OPO）得到了展示。在声光调 Q 的 Nd:YAG/SrWO4 拉曼激光器中，成功地将 OPO 和受激拉曼散射技术结合在一起。该器件有效地实现了三步转换：从激光二极管的 808nm 波长转换到 1064nm 的基频波长；接下来，转换到 1180nm 的斯托克斯波长；最后，转换到 1810nm 的 OPO 信号波长。在入射二极管功率为 7.2W 和脉冲重复率为 15kHz 的情况下，获得了 485mW 的平均信号功率，二极管到信号的转换效率为 6.75%。测量了信号波在水平和垂直方向上的光束质量因子（M2），其值分别为 1.7±0.2。还讨论了系统、热透镜和腔的稳定性参数的数值输出功率结果。
