https://scholars.lib.ntu.edu.tw/handle/123456789/316302
標題: | On the deposition of Cr3-δO4 spinel particles upon laser-heated pedestal growth of Cr:YAG fiber | 作者: | Ji, J.Y. Shen, P. Chen, J.C. Kao, F.J. SHENG-LUNG HUANG Lo, C.Y. |
關鍵字: | 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 | 公開日期: | 2005 | 卷: | 282 | 期: | 44624 | 起(迄)頁: | 343-352 | 來源出版物: | Journal of Crystal Growth | 摘要: | 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. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-23144463102&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/316302 |
ISSN: | 00220248 | DOI: | 10.1016/j.jcrysgro.2005.05.014 | SDG/關鍵字: | 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 |
顯示於: | 光電工程學研究所 |
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