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Raman microprobe analysis of preforms and optical fibers
W Carvalho1, P Dumas, M Delhaye
1Institut d'Optique, Centre d'Orsay, 91405 Orsay, France.
Applied Optics
|December 1, 1984
Summary
Raman microprobe analysis accurately mapped dopant concentrations in optical fibers. This technique effectively detected fluorine, suggesting its diffusion in silica materials.
Area of Science:
- Materials Science
- Analytical Chemistry
- Optical Engineering
Background:
- Accurate dopant profiling is crucial for optical fiber performance.
- Traditional methods like electron microprobe analysis have limitations.
Purpose of the Study:
- To evaluate Raman microprobe spectroscopy for dopant analysis in optical fiber preforms and fibers.
- To determine the spatial distribution of germanium, phosphorus, and fluorine dopants.
Main Methods:
- Utilized a Raman microprobe with 2-microm spatial resolution.
- Analyzed dopant concentrations in preforms and optical fibers.
- Compared results with electron microprobe data for germanium and phosphorus.
Main Results:
- Raman microprobe successfully mapped germanium, phosphorus, and fluorine concentrations.
- Results for germanium and phosphorus correlated well with electron microprobe data.
- Raman spectroscopy demonstrated high sensitivity for fluorine detection.
Conclusions:
- Raman microprobe is a viable technique for dopant analysis in optical fibers.
- Fluorine detection is significantly enhanced with Raman spectroscopy.
- Evidence suggests fluorine diffusion in both doped and undoped silica.
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