Nieuwenhuis A F, Lee C J, van der Slot P J M, Lindsay I D, Gross P, Boller K-J
Laser Physics and Nonlinear Optics Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Opt Lett. 2008 Jan 1;33(1):52-4. doi: 10.1364/ol.33.000052.
We report a singly resonant optical parametric oscillator (SRO) based on a ZnGeP(2) crystal directly pumped by a lamp-pumped Q-switched CrTmHo:YAG laser. The IR was tunable from 4.7 to 7.8 microm via crystal angle tuning. A maximum optical to optical efficiency of 56% was obtained from the pump (2.09 microm) to total IR at a pump energy of 6.5 mJ. The corresponding idler energy was 1.45 mJ. The SRO was measured to have a slope efficiency of 64% and a threshold of 1 mJ. The spatial beam quality of the idler, characterized by the M(2) parameter, was 1.38 when the SRO was pumped at 2.5 times threshold. These results show that ZnGeP(2) optical parametric oscillators directly pumped by a CrTmHo:YAG laser can be operated efficiently, while maintaining good IR beam quality.
我们报道了一种基于ZnGeP₂晶体的单共振光学参量振荡器（SRO），该晶体由灯泵浦调Q CrTmHo:YAG激光器直接泵浦。通过晶体角度调谐，红外波长可在4.7至7.8微米范围内调谐。在泵浦能量为6.5 mJ时，从泵浦光（2.09微米）到总红外光的最大光光效率为56%。相应的闲频光能量为1.45 mJ。测量得到该SRO的斜率效率为64%，阈值为1 mJ。当SRO以2.5倍阈值泵浦时，以M²参数表征的闲频光空间光束质量为1.38。这些结果表明，由CrTmHo:YAG激光器直接泵浦的ZnGeP₂光学参量振荡器能够高效运行，同时保持良好的红外光束质量。
