合金铝表面近红外波段光学常数的反演与双向反射分布函数的计算  

Optical Constants Deduction and Scattering Bidirectional Reflectance Distribution Function Computation of Alloy Aluminum Surface in Near Infrared Waveband

作　　者：杨玉峰[1] 吴振森[1] 曹运华[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《光学学报》2011年第2期262-267,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60771038);中央高校基本科研业务费专项资金(K50510070009)资助课题

摘　　要：采用分光光度计测得了0.5-1.5μm波段抛光合金铝样片的镜反射率谱,利用常数外推法和幂函数外推法将其进行外推,获得了全波段的镜反射率谱。然后根据克拉默斯-克勒尼希（Kramers-Kronig）方法,反演获得了该样片在0.5-2.5μm波段的复折射率和介电常数,与0.5-1.5μm波段椭偏仪的测量结果吻合良好。利用基尔霍夫法和反演得到的介电常数,计算了波长1.06μm时粗糙合金铝样片的散射双向反射分布函数（BRDF）,与BRDF测量仪得到的结果吻合良好。利用样片的粗糙度参数和外推的1.5-2.5μm波段的介电常数,获得了粗糙合金铝样片在该波段的散射BRDF。Abstract Polishing alloy aluminum sample＇s specular reflection spectrum in waveband 0.5-1.5 μm is measured by spectrophotometer, then it can be extrapolated to the all band by using constant and power function extrapolation. According to Kramers-Kronig （K-K） method, complex refractive index and dielectric constant of this sample in waveband 0.5-2.5 μm are deduced, this result well coincides with ellipsometer＇s data in waveband 0.5 - 1.5 μm. The rough alloy aluminum sample＇s scattering bidirectional reflectance distribution function （BRDF） at 1.06 μm is calculated using Kirchhoff method and deduced dielectric constant, which well coincides with BRDF measurer＇s data. Roughness parameters and dielectric constants extrapolated in waveband 1.5-2.5 μm is used to calculate scattering BRDF of the rough alloy aluminum sample in this waveband.

关 键 词：散射 克拉默斯-克勒尼希方法 粗糙度参数 光学常数 双向反射分布函数 

分 类 号：O436.2[机械工程—光学工程]