Fluorescence mapping of oxidation states of Cr ions in YAG crystal fibers

被引：34

作者：

Chen, JC ^{[1
]}

Lo, CY ^{[1
]}

Huang, KY ^{[1
]}

Kao, FJ ^{[1
]}

Tu, SY ^{[1
]}

Huang, SL ^{[1
]}

机构：

[1] Natl Sun Yat Sen Univ, Inst Electroopt Engn, Kaohsiung 804, Taiwan

来源：

JOURNAL OF CRYSTAL GROWTH | 2005年 / 274卷 / 3-4期

关键词：

doping; optical microscopy; laser heated pedestal growth;

D O I：

10.1016/j.jcrysgro.2004.10.063

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We have demonstrated the use of laser scanning confocal microscope for mapping the refractive index as well as Cr3+ and Cr4+ fluorescence in Cr:YAG crystal fibers with 1 mum spatial resolution. The corresponding sensitivities for Cr3+ and Cr4+ fluorescence intensities are 1.6 x 10(17)/cm(3) and 7.5 x 10(15)/cm(3), respectively. The share of Cr4+ ions in the total Cr concentration is found to be proportional to the ratio of Ca to Cr concentrations. However, only less than 1% of the Ca2+ ions become active in charge compensation. The concentration of Cr4+ ions is higher near the center of the crystal fiber when the core diameter is less than 300 mum. In addition, stress-induced striations created near the fiber center disappear when the fiber diameter is smaller tharl 500 mum. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：522 / 529

页数：8

共 28 条

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