高重复率RTP电光调Q Nd:YAG激光特性研究

High-repetition-rate RTP electro-optic Q-switched Nd:YAG laser

RTP(RbTiOPO4)是一种新型电光晶体,具有高电阻率、大电光系数、高抗光伤阈值等优点,成为理想的电光调Q晶体。采用两块4mm×4mm×5.3mm的RTP晶体作为电光开关,实现了高重复率RTP电光调Q Nd:YAG1064nm激光运转,获得了不同重复率、不同输出镜透过率情况下单脉冲能量和脉冲宽度与泵浦能量的依赖关系。随着泵浦能量的增加,脉冲宽度变窄,脉冲能量变大。在相同的泵浦能量下,重复率越大,脉宽越宽,脉冲能量越小。在平面波近似下,给出了RTP电光调Q Nd:YAG激光运转的耦合速率方程,数值求解方程的理论计算与实验结果相符。

RTP （RbTiOPO4） is a new type of electro-optic crystal and considered as an ideal electro-optic switcher due to the advantages of high resistivity,large electro-optic coefficients,high damage threshold. By using double RTP crystals as electro-optic Q-switch,a high-repetition-rate electro-optic Q-switched Nd：YAG laser was obtained. For different repetition rates and coupling transmission,the single pulse energy and the pulse width versus pump energy were presented. With increasing the pump energy,the narrower pulse width and the greater pulse energy were obtained. At the same pump energy,the higher repetition rate,the wider the pulse width and the smaller the pulse energy. Under the plane-wave approximation,the rate-equations describing the Q-switched Nd：YAG laser were given and the numerical solutions of the equations were well in agreement with the experimental results.