摘要
采用数值计算方法对薄膜材料的Z-扫描参量进行研究.对不同激光脉宽下Z-扫描的三阶非线性折射系数和吸收系数进行分析,结果显示不同等级的脉宽激光器对计算结果的数量级影响很大.对不同小孔光阑半径的Z-扫描闭孔曲线进行仿真,结果显示光阑小孔越小,获得特征曲线的峰谷值越明显.对不同光阑离透镜焦点的距离值进行Z-扫描闭孔曲线仿真,结果显示距离为1/2透镜焦距值时闭孔Z-扫描曲线能得到相对较大的峰谷差值.数值分析结果与相关文献报道的实验结果基本一致.
Parameters about Z-scan measurements of thin films were investigated using numerical methods. Differences of the magnitude of Z-scan＇s third order nonlinear refractive index and absorption coefficient were observed under different laser pulse duration using numerical simulation. The more obvious peakvalley features of Z-scan＇ s closed aperture curve were observed with the smaller aperture hole by simulating under aperture radius for different hole. The more obvious peak-valley features of Z-scan＇s closed aperture curve were observed by simulating under different distances of aperture lens to focus, when distance is 1/2 lens focal length. The experimental results reported in the literature related agree well with the theoretical analysis. The results have some significance to the measurement of Z-scan with films.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2011年第9期1333-1337,共5页
Acta Photonica Sinica
基金
重庆市科委科技计划项目院士专项(No.2008BC4003)资助
关键词
Z-扫描
薄膜材料
三阶光学非线性
激光脉宽
Z-scan
Film materials
Third-order optical nonlinearities
Laser pulse duration
