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

Jian Cheng Chen, Chia Yao Lo, Kuang Yao Huang, Fu Jen Kao, Shih Yu Tu, Sheng Lung Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


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 μm spatial resolution. The corresponding sensitivities for Cr3+ and Cr4+ fluorescence intensities are 1.6×1017/cm3 and 7.5×1015/cm3, respectively. The share of Cr 4+ 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 Ca 2+ 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 μm. In addition, stress-induced striations created near the fiber center disappear when the fiber diameter is smaller than 500 μm.

Original languageEnglish
Pages (from-to)522-529
Number of pages8
JournalJournal of Crystal Growth
Issue number3-4
StatePublished - 1 Feb 2005


  • A1. Doping
  • A1. Optical microscopy
  • A2. Laser heated pedestal growth


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