近top-hat光束Z扫描理论分析  

Z scan analysis for near top-hat beams

作　　者：杨新江[1] 臧维平[1] 田建国[1] 刘智波[1] 周文远[1] 张春平[1] 张光寅[1] 

机构地区：[1]南开大学物理科学学院光子学中心,天津300071

出　　处：《物理学报》2005年第6期2735-2738,共4页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60025512);教育部科学技术研究重点(重大)项目(批准号00026);高等学校骨干教师资助计划项目;霍英东教育基金资助的课题(批准号:71008).~~

摘　　要：利用快速Hankel变换的方法,对薄介质的Z扫描进行了理论分析。讨论了近top hat光束Z扫描曲线的特征,分析了闭孔近top hat光束下限制光阑半径与光束扩束半径之比(光阑束腰比)对归一化透射率的影响,通过理论分析,给出了获得最佳测量灵敏度的光阑束腰比值.在最佳灵敏度的实验配置下分析了远场光阑的大小对归一化透射率的影响.The Z scan theory of thin optically nonlinear medium, by using the fast Hankel transform,is analyzed. The characteristics of Z scan curves under near top-hat beams are discussed. Meanwhile, the influence of the ratio (diaphragm-girdling ratio) of the limiting diaphragm radius to the radius of expanded beams on normalized transmittance using near top-hat beams under closed-aperture is analyzed. Through theoretical analysis, the ratio with the best sensitivity is given. Finally, the influence of the size of the far-field diaphragm on normalized transmittance under the experimental configuration with the best sensitivity is analyzed.

关 键 词：高精度快速Hankel变换 近top—hat光束 高斯光束 Z扫描 线性折射率 

分 类 号：O435[机械工程—光学工程]