Semi-empirical estimation of the attenuation loss for amorphous ZBLAN glass

摘要

ZBLAN glass tends to undergo heavy devitrification, forming crystallites that act as scattering centers and results in a large attenuation loss. In this study, attenuation loss values were obtained for ZBLAN glass test samples that were melted and then cooled rapidly at a rate of 4000 degrees C/min, which yielded amorphous samples that were free of microano-crystalline inclusions. Using an approach by Forouhi and Bloomer, which incorporates Kramers-Kronig relations, in conjunction with measured optical data using ellipsometry, an attenuation loss of 0.092dB/Km at 1800nm wavelength was estimated for amorphous ZBLAN test samples.