@article{0c6b48334ba04f1a857cfa47376182b1,
title = "Composition dependence of the microspectroscopy of Cr ions in double-clad Cr:YAG crystal fiber",
abstract = "We have demonstrated the use of microspectroscopy for measuring the Cr 3+ and Cr4+ fluorescence spectra in double-clad Cr:YAG crystal fiber. The emission spectra of Cr3+ and Cr4+ are detected from core and inner cladding. The Cr3+ spectrum in the inner cladding shows a broad-band emission from 650 to 950 nm, while the emission of Cr4+ occurs in the range of 1.15-1.55 μm with a peak around 1.22 μm. The characteristic of Cr ion at high-field sites shows a narrow-band emission (2E →4A2 for Cr3+; 1E →3A2 for Cr4+), whereas that at low-field sites shows a broad-band emission (4T →4A2 for Cr3+; 3T →3A2 for Cr4+). The emission intensity ratio of high-field sites to low-field sites in the inner cladding with different compositions has been investigated. It varies from 20% to 29% for Cr3+ and from 7.1% to 11.3% for Cr4+ when the concentration of Si O2 increases from 26.9 to 43.0 wt %.",
author = "Chen, {Jian Cheng} and Huang, {Kuang Yao} and Tsai, {Cheng Nan} and Lin, {Yen Sheng} and Lai, {Chien Chih} and Liu, {Geng Yu} and Kao, {Fu Jen} and Huang, {Sheng Lung} and Lo, {Chia Yao} and Pouyen Shen",
note = "Funding Information: The authors appreciated B. Chiang for composition analysis in EPMA measurement. The authors also gratefully acknowledge the support for this research by the Ministry of Education Program for Promoting Academic Excellence of Universities under Grant No. 91-E-FA08-1-4. FIG. 1. (a) Distribution of Cr 2 O 3 concentration and Cr 3 + fluorescence intensity. The inset shows Cr 3 + fluorescence intensity mapping. (b) Cr 3 + fluorescence spectra at DCF core and inner cladding. The dash curve denotes the broad T 2 4 → A 2 4 emission band at core and the spectrum in the inner cladding which are fitted by Gaussian profiles. FIG. 2. (a) Cr 3 + fluorescence spectra associated with different positions in inner cladding, corresponding to various concentrations of Si O 2 . (b) Five Gaussian-peak-fitted curves for Cr 3 + fluorescence spectra with various concentrations of Si O 2 . The inset shows the emission intensity ratio of Cr 3 + in HFS to LFS. FIG. 3. (a) Distribution of CaO concentration and Cr 4 + fluorescence intensity. The inset shows Cr 4 + fluorescence intensity mapping. (b) Cr 4 + fluorescence spectra at DCF core and inner cladding. The spectrum in the inner is fitted by Gaussian profiles. FIG. 4. (a) Cr 4 + fluorescence spectra associated with different positions in inner cladding, corresponding to various concentrations of Si O 2 . (b) Seven Gaussian-peak-fitted curves for Cr 4 + fluorescence spectra with various concentrations of Si O 2 . The inset shows the emission intensity ratio of Cr 4 + in HFS to LFS. ",
year = "2006",
month = may,
day = "1",
doi = "10.1063/1.2196220",
language = "English",
volume = "99",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics",
number = "9",
}