Cr^(4+):YAG飞秒脉冲激光器光路结构的优化设计  

Optimum Design of Optics Structure for Femto-Second Laser Based on Cr^(4+):YAG Crystal

作　　者：彭建[1,2] 逯志欣[1] 杨伯君[1] 于丽[1] 

机构地区：[1]北京邮电大学理学院,北京100876 [2]华北电力大学数理系,北京102206

出　　处：《中国激光》2009年第7期1835-1842,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(60578043);北京市教委共建项目(XK100130837)资助课题

摘　　要：通过理论分析和数值计算,对Cr4+:YAG飞秒脉冲激光器光路结构的优化设计进行了研究。提出了在谐振腔内插入一薄聚焦透镜代替另一折叠镜以降低光路的复杂性。为研究起色散补偿作用的棱镜对对腔的稳定性和像散带来的影响,导出了棱镜对的光传输矩阵。通过编程计算得出了连续运转和锁模运转两种工作方式下的不同参数的谐振腔稳区图,对激光器工作点的选择做出了论述。定义了像散补偿失配因子F,做出了像散补偿区域分布图。指出F<0.05的区域具有良好的像散补偿特性,也是激光器光路结构参数设计必须要考虑的重要方面。论证了改变抽运光聚焦透镜的位置可实现抽运光与腔内振荡光的匹配。Optimum design of the optics structure for the femto-second laser aimed at Cr^4＋ ： YAG crystal is investigated by theoretic analysis and numerical calculation. So as to reduce the complexity, a thin focus lens is plugged into the resonator to replace the fold-mirror. The pair of prisms can affect the stability and astigmatism besides the dispersion compensation, so the optics transmission matrix is deduced to eliminate them. The stability diagrams are obtained for continue-wave-operation and mode-lock-operation with diverse parameters by computer programming, and the way for, selecting the work point is described. The un-match factor （F） of the astigmatism compensation is defined, and the area distribution diagram is painted according to it. The excellent astigmatism compensation can be possessed for running laser on the stable area with F〈0.05. The match of pump and oscillating laser beams within the cavity can be achieved by changing the position of the focus lens.

关 键 词：激光器 飞秒激光 优化设计 矩阵光学 谐振腔 像散补偿 

分 类 号：TN248.1[电子电信—物理电子学] TN242