Zhu Haiyong, Zhang Ge, Chen Huibin, Huang Chenghui, Wei Yong, Duan Yanmin, Huang Yidong, Wang Hongyan, Qiu Gang
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Opt Express. 2009 Nov 9;17(23):20669-74. doi: 10.1364/OE.17.020669.
An efficient intracavity KTA optical parametric oscillator (OPO) driven by diode-end-pumped acousto-optical Q-switched Nd:YVO(4) laser is demonstrated. The mode mismatch between fundamental cavity and OPO cavity caused by the thermal lens effect in Nd:YVO(4) crystal as the pump power increased was studied. To lessen mode mismatch, a thermal lens-like cavity mirror made of plane BK7 glass induced by idler absorption was introduced into the OPO cavity. Under a diode pump power of 20 W, a maximum 1535nm light output power of 3.6 W was achieved at the pulse repetition rate of 60 kHz, corresponding to a diode-to-signal conversion efficiency of 18%. This is the highest efficiency reported for eye-safe laser based on intracavity OPO.
演示了一种由二极管端面泵浦声光调Q Nd:YVO₄激光器驱动的高效腔内KTA光学参量振荡器（OPO）。研究了随着泵浦功率增加，Nd:YVO₄晶体中的热透镜效应导致的基模腔与OPO腔之间的模式失配。为了减少模式失配，在OPO腔中引入了由闲频光吸收诱导的平面BK7玻璃制成的类似热透镜的腔镜。在20W的二极管泵浦功率下，在60kHz的脉冲重复频率下实现了3.6W的最大1535nm光输出功率，对应二极管到信号的转换效率为18%。这是基于腔内OPO的人眼安全激光器所报道的最高效率。
