Spectroscopic investigations on Nd3BBFB Nd3BLFB Er3BBFB AND Er3BLFB glasses for infra red laser applications

Abstract

The present work concerns with the spectroscopic investigations on Nd3+:BBFB, Nd3+:BLFB, Er3+:BBFB and Er3+:BLFB glasses for infra-red laser applications. Glass is a non-crystalline solid and a super cooled liquid which are prepared by melt quenching technique. In the view of their scientific and technological applications, glasses are exposed to spectroscopic investigations for their characterization. Borate glasses are potential candidates for applications in solid-state infrared lasers, colour filters and optoelectronics devices, etc. Laser is a coherent high energy radiation in the electromagnetic spectrum. Glasses are used in lasers as active and passive components. Particularly in the insulating host lasers, the glasses are the active components like gain media. In glasses, trivalent lanthanide ions can be doped as active ions. Changing the lanthanide ions can change the lasing properties. Host material may also alter the broadness of the emission peaks, and hence host selection is important from luminescence point of view. The thesis consists of six chapters and as follows. Chapter I is devoted to with the introduction of glasses, formation of glasses and classification of glasses with its applications. The detailed analysis of trivalent lanthanide ions and its structure in the host matrix, Development history of Judd-Ofelt theory are described. The structural and optical characterization with physical and luminescence parameters also discussed. Chapter II presents the new series of neodymium doped barium bismuth fluoroborate glasses with the chemical composition of (70-x)H3BO3 - 5Bi2O3- 10BaCO3 - 7.5CaF2 - 7.5ZnO - xNd2O3 (where x= 0.05, 0.1, 0.25, 0.5, 1, 2 (in wt %) have been prepared by the conventional melt quenching method. newline