Mr. Binghong Liu Profile

Binghong Liu

at Fudan Univ

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Proceedings Article | 29 November 2012 Paper

Raman spectroscopy system with hollow fiber probes

Bing-hong Liu, Yi-Wei Shi

Proceedings Volume 8552, 85520L (2012) https://doi.org/10.1117/12.999652

KEYWORDS: Raman spectroscopy, Silver, Liquids, Optical fibers, Hydrogen fluoride lasers, Silica, Spectroscopy, Signal to noise ratio, Optical filters, Fiber lasers

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A Raman remote spectroscopy system was realized using flexible hollow optical fiber as laser emittion and signal collection probes. A silver-coated hollow fiber has low-loss property and flat transmission characteristics in the visible wavelength regions. Compared with conventional silica optical fiber, little background fluorescence noise was observed with optical fiber as the probe, which would be of great advantages to the detection in low frequency Raman shift region. The complex filtering and focusing system was thus unnecessary. The Raman spectra of CaCO₃ and PE were obtained by using the system and a reasonable signal to noise ratio was attained without any lens. Experiments with probes made of conventional silica optical fibers were also conducted for comparisons. Furthermore, a silver-coated hollow glass waveguide was used as sample cell to detect liquid phase sample. We used a 6 cm-long hollow fiber as the liquid cell and Butt-couplings with emitting and collecting fibers. Experiment results show that the system obtained high signal to noise ratio because of the longer optical length between sample and laser light. We also give the elementary theoretical analysis for the hollow fiber sample cell. The parameters of the fiber which would affect the system were discussed. Hollow fiber has shown to be a potential fiber probe or sample cell for Raman spectroscopy.

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