聚焦光束的傅里叶数值算法研究  

Research on the Fourier Numerical Algorithm of Focused Beam

作　　者：卢光山[1] 胡巍[1] 傅喜泉[1] 喻松[1] 郭弘[1] 

机构地区：[1]华南师范大学传输光学实验室,广东广州510631

出　　处：《中国激光》2003年第3期227-230,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金重点项目 (6 978980 1 );广东省自然科学基金团队项目 (2 0 0 0 30 6 1 );国家高技术惯性约束聚变主题的部分资助

摘　　要：由于取样定理的限制 ,常规的基于快速傅里叶变换 (FFT)光束传输模拟算法不能进行任意焦距聚焦光束的传输过程的模拟。为此提出了一种新算法 :将球面波因子提出 ,将会聚光束的传输过程转化为非会聚光束的传输 ,从而间接地求得了聚焦光束的光场分布。In simulation of focused beam propagation with arbitrary focal length, the traditional beam propagation algorithm based on Fast Fourier Transform will fail to give right results due to the limitation of the sampling theorem. A new algorithm is given, in which the factor of spherical wave front is removing explicitly. Thus the propagation of a focused beam could be evaluated indirectly from propagation of an unfocused beam. The results in two cases are connected inherently by Fresnel number, which plays a key role in focused beam propagation.

关 键 词：激光物理 聚焦光束 菲涅耳数 取样定理 带宽乘积 

分 类 号：O437[机械工程—光学工程] TN012[理学—光学]