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双调Q复合腔Nd∶YAG-Cr4+∶YAG激光器的研究
引用本文:王加贤,吕凤萍,苏娅菲. 双调Q复合腔Nd∶YAG-Cr4+∶YAG激光器的研究[J]. 中国激光, 2004, 31(4): 399-402
作者姓名:王加贤  吕凤萍  苏娅菲
作者单位:华侨大学信息科学与工程学院,福建,泉州,362011
基金项目:福建省自然科学基金 (编号 :A0 310 0 2 2),国务院侨办科研基金(编号:0 2QZR0 4 )资助项目
摘    要:报道一种有实用价值的、构思新颖的双调Q ,双波长输出的Nd∶YAG Cr4+∶YAG激光器。在由两个平凹腔耦合而成的复合腔中 ,Cr4+∶YAG晶体既作为可饱和吸收体对Nd∶YAG发射的 1 0 6 μm激光被动调Q ,又作为增益介质在 1 0 6 μm激光脉冲作用下发射中心波长 1 4 4 μm的激光脉冲。该激光器实现了 1 0 6 μm激光被动调Q和 1 4 4 μm激光增益调Q的双波长激光振荡 ,输出的 1 0 6 μm和 1 4 4 μm激光脉冲的能量和脉冲宽度分别为 18mJ,5 2ns和0 2 5mJ,19ns ;后者的脉冲宽度约为前者的三分之一。理论上 ,根据Cr4+∶YAG的能级结构和复合腔特点 ,分析了双调Q的工作机理 ;从速率方程出发导出双调Q复合腔激光器输出的 1 4 4 μm激光脉冲宽度和腔内 1 0 6 μm激光功率的关系。 1 4 4 μm激光脉冲时间宽度的理论计算值 ( 2 1 7ns)与实验结果 ( 19ns)基本相符。

关 键 词:激光技术  双调Q  复合腔  Cr4+∶YAG  脉冲宽度
收稿时间:2003-08-14

Investigation on a Compound Resonator Nd∶YAG-Cr4+∶YAG Laser with Dual Q-Switching Operation
WANG Jia xian,Lu Feng ping,SU Ya fei. Investigation on a Compound Resonator Nd∶YAG-Cr4+∶YAG Laser with Dual Q-Switching Operation[J]. Chinese Journal of Lasers, 2004, 31(4): 399-402
Authors:WANG Jia xian  Lu Feng ping  SU Ya fei
Abstract:A pratical and novel Nd∶YAG-Cr4+∶YAG laser with dual Q-switching and dual-wavelength output is reported. In the compound resonator couplied with two plano-concave cavities, a single Cr4+∶YAG is both a saturable-absorber of Q-switch at 1.06 μm laser from Nd∶YAG and a laser gain medium at 1.44 μm with 1.06 μm laser as its intra-cavity pump source. the dual-wavelength laser oscillation with passively Q-switched 1.06 μm laser and gain-switched 1.44 μm laser is realized in the laser. The output energy and pulse duration of 1.06 μm and 1.44 μm laser are 18 mJ, 52 ns and 0.2 mJ, 19 ns respectively, and the pulse duration of the latter is about one of third of the former. The working mechanism of the dual Q-switching is analyzed in theory according to energy levels of the Cr4+∶YAG and the feature of the compound resonator. Based on the rate equations, the relationship between pulse duration of 1.44 μm laser and the intra-cavity power of 1.06 μm laser is derived. The theoretical data (21.7 ns) of pulse duration of 1.44 μm laser is roughly consistent with the experimental resultt (19 ns).
Keywords:laser technique   dual Q-switching   compound resonator   Cr4+∶YAG   pulse duration
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