Jia Fu-qiang, Zheng Quan, Xue Qing-hua, Bu Yi-kun, Qian Long-sheng
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Appl Opt. 2007 May 20;46(15):2975-9. doi: 10.1364/ao.46.002975.
We describe experimental results with a diode-pumped, passively Q-switched extracavity second- and third-harmonic generation. Cr:YAG is used as a saturable absorber for pulse generation. Taking into account the thermal effects of Nd:YAG at high incident pump power, we use a short plane-to-plane cavity configuration to take advantage of the maximum pump power and obtain the compactness structure. At the same time, we use the type-I critical phase-matched lithium triborate crystal to generate light at 532 nm and mix the residual fundamental at 1064 nm and the second-harmonic wave at 532 nm in the type-II critical phase-matched lithium triborate crystal for UV light generation at 355 nm. A third-harmonic-generation output power of 1.32 W is achieved at the incident pump power of 27.5 W, corresponding to an optical-to-optical efficiency of 4.8%. The instability of the UV laser power is less than 5% for 4 h.
我们描述了二极管泵浦、被动调Q外腔二次和三次谐波产生的实验结果。Cr:YAG用作产生脉冲的饱和吸收体。考虑到高入射泵浦功率下Nd:YAG的热效应，我们采用短的平面到平面腔结构以利用最大泵浦功率并获得紧凑结构。同时，我们使用I类临界相位匹配的硼酸锂晶体产生532nm的光，并在II类临界相位匹配的硼酸锂晶体中将1064nm的残余基波和532nm的二次谐波混合以产生355nm的紫外光。在27.5W的入射泵浦功率下实现了1.32W的三次谐波产生输出功率，对应光到光效率为4.8%。紫外激光功率在4小时内的不稳定性小于5%。
