Abstract
Analytical expressions, based on single and multiple incoherent beams at slab interfaces, are revised. It is applied for determining spectral refractive indices of plane parallel slab material. These expressions were introduced by Pankove and have been widely used in optical measure- ments. However, some researchers misuse these expressions by using the total slab reflectance instead of the interface reflectance. Refractive indices of four glassy slabs with different thicknesses and composition are experimentally measured and compared with that given by the glasses manufacturer. These expressions give precise results with experimental error of about 0.022 across broad spectral range of 0.2 to 2.5 um. Com- parisons between the correct use and misused expressions in case of single and multiple beams are presented. The misuse of expressions pro- duces percentage deviation from the reference values of about 17.6% to 24.4% depending on the slab refractive index. © 2012 Society of Photo-Optical
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