Journal
MATERIALS RESEARCH BULLETIN
Volume 35, Issue 3, Pages 471-476Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0025-5408(00)00229-4
Keywords
optical materials; crystal growth; optical properties
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Lead bromide (PbBr2) crystals in [001] 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.
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