Duan Yanmin, Zhu Haiyong, Ye Yanlin, Zhang Dong, Zhang Ge, Tang Dingyuan
Opt Lett. 2014 Mar 1;39(5):1314-7. doi: 10.1364/OL.39.001314.
This Letter describes an intracavity pumped optical parametric oscillator (OPO) based on noncritical phase matching RbTiOPO4 (RTP) crystal driven by a laser diode end-pumping acousto-optic Q-switched Nd:YVO4 laser. Simultaneous efficient signal light at 1.6 μm and idler light at 3.1 μm outputs were obtained. At an incident pump power of 10.5 W and a Q-switching pulse repetition frequency of 60 kHz, 1.42 W at center wavelength of about 1619 nm and 0.38 W at 3108 nm were achieved, with the diode to OPO total output conversion efficiency up to 17.1%. The pulse width is about 6.5 ns for the signal light corresponding to the fundamental light at 1064 nm of about 10 ns. The spectral widths of the signal and idler light are narrower than 0.5 and 1.0 nm. The result shows that the RTP crystal is an efficient crystal to generate eye-safe and mid-infrared lights by making full use of noncritical phase matching.
本信函描述了一种基于非临界相位匹配的RbTiOPO4（RTP）晶体的腔内泵浦光学参量振荡器（OPO），该晶体由激光二极管端面泵浦声光调Q的Nd:YVO4激光器驱动。同时获得了波长为1.6μm的高效信号光和波长为3.1μm的闲频光输出。在泵浦光入射功率为10.5W、调Q脉冲重复频率为60kHz时，在中心波长约1619nm处获得了1.42W的输出功率，在3108nm处获得了0.38W的输出功率，二极管到OPO的总输出转换效率高达17.1%。信号光的脉冲宽度约为6.5ns，对应于1064nm基频光的脉冲宽度约为10ns。信号光和闲频光的光谱宽度分别窄于0.5nm和1.0nm。结果表明，RTP晶体通过充分利用非临界相位匹配，是一种产生人眼安全光和中红外光的高效晶体。
