On the deposition of Cr3-δO4 spinel particles upon laser-heated pedestal growth of Cr:YAG fiber
Journal
Journal of Crystal Growth
Journal Volume
282
Journal Issue
44624
Pages
343-352
Date Issued
2005
Author(s)
Abstract
The microstructures of Cr4+:YAG crystal fibers grown along [1 1 1] direction by laser-heated pedestal growth method were studied by optical and analytical electron microscopy. Curved growth ledges were found on the round side surface of the fiber grown at a relatively high speed. In contrast, nonepitaxial Cr3-δO4 crystallites with spinel-type structure were formed on the {1 1 2} side surfaces, via an intermediate surface melt, when the fibers were grown at a lower speed. The deposition of Cr3-δO4, rather than segregation of Cr and Ca codopants, as of concern to the Cr4+ fluorescence, can be rationalized by a high crystal field stabilization of octahedrally coordinated Cr3+ attained in rather refractory and close packed oxide. © 2005 Elsevier B.V. All rights reserved.
Subjects
Chromium; Crystal structure; Doping (additives); Garnets; Optical communication; Optical microscopy; Positive ions; Segregation (metallography); Solid state lasers; Yttrium compounds; Crystal fiber; Crystal fields; Laser-heated pedestal growth; Yttrium aliminum garnets (YAG); Crystal growth
SDGs
Other Subjects
Chromium; Crystal structure; Doping (additives); Garnets; Optical communication; Optical microscopy; Positive ions; Segregation (metallography); Solid state lasers; Yttrium compounds; Crystal fiber; Crystal fields; Laser-heated pedestal growth; Yttrium aliminum garnets (YAG); Crystal growth
Type
journal article