摘要
从较直观的概念出发,设计基于轴棱锥带平面耦合输出镜的贝塞尔-高斯谐振腔。应用Fox-Li数值迭代法对谐振腔横向光场模式进行较严格的分析,同时采用数值积分的方法,由输出镜面上光场采样点的数值直接模拟腔外输出光场分布情况。数值模拟结果与理论结果比较表明,该谐振腔的主模式与零阶贝塞尔-高斯光特征相似。针对实际中腔长可能并不严格地与最初设计腔长一致,讨论了腔长变化对谐振腔主模式分布的影响,发现当腔长变化较小时,谐振腔的横向模式特征基本保持不变。利用Nd:YAG激光器设计贝塞尔-高斯谐振腔进行实验,光束分析仪记录的输出光强横向分布与理论预期基本一致。
A simple concept is applied to the construction of a Bessel-Gauss resonator based on an axicon witha plane output mirror. Fox-Li algorithm and numerical integral are applied respectively to describe the radical amplitude at output mirror and the three-dimensional field distribution of output beam. Analysis reveals that the dominant mode of the resonator has similar features as zero-order Bessel-Gauss beams do. Effect of varying the cavity length on the output transverse profile of the dominant mode of the cavity is discussed. Simulation results show that the features of the dominant mode of the resonator remain unchanged when the cavity length change is small. The resonator scheme based on Nd, YAG laser was implemented in an experiment to confirm the possibility of generating zero-order Bessel-Gauss beams. The output transverse intensity distributions captured by beam analyzer roughly agree with the theoretical expectations.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2008年第1期26-30,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金资助课题(60477041)
福建省自然科学基金资助课题(A0710011
A0410017)
