北京理工大学光电学院光电子所, 北京 100081
报道了激光二极管(LD)抽运单块非平面环形腔(NPRO)Nd:YAG激光器和LD抽运单块键合晶体非平面环形腔TmYAG激光器实现单频运转的实验结果。采用LD抽运的单块非平面环形腔Nd:YAG激光器, 分别获得了1.876 W和616 mW的1064 nm和1319 nm的单频激光输出, 对应的光-光转换效率分别为53.4%和19.2%。采用LD抽运单块键合晶体非平面环形腔TmYAG激光器, 获得了878 mW的2 μm单频激光输出, 光-光转换效率为18.8%。为了减小2 μm激光器的热效应, 采用一种新型的YAG+TmYAG+YAG键合单块非平面晶体结构形式并取得了良好的效果。
激光器 单频激光 非平面环形腔 单块结构 键合晶体
北京理工大学信息科学技术学院光电工程系, 北京 100081
研究了输出波长为2.018 μm的激光二极管(LD)抽运Tm:YAG激光器。通过准三能级系统的速率方程, 分析了激光系统的抽运阈值和斜率效率。同时, 利用ABCD矩阵分析了平凹腔和双凹腔的腔型稳定条件和模式匹配情况。实验时采用785 nm的光纤耦合半导体激光器为抽运源, 当采用平凹直腔, Tm:YAG晶体为5 ℃时, 获得了4.04 W的连续激光输出, 激光器斜率效率为35.4%, 光-光转换效率为26.4%。实验比较了不同晶体温度下Tm:YAG激光器的阈值、功率和效率。实验结果与理论分析基本吻合。此外, 还研究了激光器腔型对激光输出功率和效率的影响。
激光技术 Tm:YAG激光器 激光二极管抽运 2 μm激光器 准三能级系统
Author Affiliations
Abstract
Department of Opto-Electronics Engineering, Beijing Institute of Technology, Beijing 100081
The twisted Laguerre-Gaussian beam was generated by transforming of Hermite-Gaussian beams through an optical system consisting of three rotated cylindrical lenses. The intensity distribution and phase structure of the twisted hollow beam were theoretically analyzed by using Collins diffraction integral. By utilizing the method of mode decomposition, the theory of transformation was analyzed. In the experiment, micro particles were trapped and rotated by this twisted beam.
激光光学 扭转对称光束 轨道角动量 光束变换 140.3460 Lasers 260.2110 Electromagnetic optics 140.3300 Laser beam shaping Chinese Optics Letters
2007, 5(2): 89
