标题：Refractive index and absorption of lead bromide crystals
作者：Ren, Q; Liu, LQ; Wang, ZG; An, XS; Zhang, GH; Xu, D
作者机构：[Ren, Q; Liu, LQ; Wang, ZG; An, XS; Zhang, GH; Xu, D]Shandong Univ, Dept Opt, Jinan 250100, Peoples R China.;[Ren, Q; Liu, LQ; Wang, ZG; 更多
通讯作者地址：[Ren, Q]Shandong Univ, Dept Opt, Jinan 250100, Peoples R China.
来源：MATERIALS RESEARCH BULLETIN
关键词：optical materials; crystal growth; optical properties
摘要：Lead bromide (PbBr2) crystals in  orientation were obtained by the Bridgman growth method. The orientation of the principal refractive axes of the crystals was determined, and their principal refractive indices were measured by the least deviation angle at eight selected wavelengths. The optical axial angle and the dispersion of refractive index in the visible spectral range were calculated by Sellmeier's formula. Optical transmission and reflection spectra were measured and the absorption coefficient alpha was determined. Using the calculated alpha(hv) dependence, the bandgap width corresponding to indirect transition was determined. (C) 2000 Elsevier Science Ltd. All rights reserved.