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Proceedings Paper

Photonic bandgap fiber-enabled Raman detection of nitrogen gas
Author(s): Rui Chen; Peter J. Codella; Renato Guida; Anis Zribi; Alexey Vert; Radislav Potyrailo; Marko Baller
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Paper Abstract

Raman detection of nitrogen gas is very difficult without a multi-pass arrangement and high laser power. Hollow-core photonic bandgap fibers (HC-PBF) provide an excellent means of concentrating light energy in a very small volume and long interaction path between gas and laser. One particular commercial fiber with a core diameter of 4.9 microns offers losses of about 1dB/m for wavelengths between 510 and 610 nm. If 514nm laser is used for excitation, the entire Raman spectrum up to above 3000 cm-1 will be contained within the transmission band of the fiber. A standard Raman microscope launches mW level 514nm laser light into the PBF and collects backscattered Raman signal exiting the fiber. The resulting spectra of nitrogen gas in air at ambient temperature and pressure exhibit a signal enhancement of about several thousand over what is attainable with the objective in air and no fiber. The design and fabrication of a flow-through cell to hold and align the fiber end allowed the instrument calibration for varying concentrations of nitrogen. The enhancement was also found to be a function of fiber length. Due to the high achieved Raman signal, rotational spectral of nitrogen and oxygen were observed in the PBF for the first time to the best of our knowledge.

Paper Details

Date Published: 29 April 2009
PDF: 7 pages
Proc. SPIE 7322, Photonic Microdevices/Microstructures for Sensing, 73220N (29 April 2009); doi: 10.1117/12.817823
Show Author Affiliations
Rui Chen, GE Global Research (United States)
Peter J. Codella, GE Global Research (United States)
Renato Guida, GE Global Research (United States)
Anis Zribi, GE Global Research (United States)
Alexey Vert, GE Global Research (United States)
Radislav Potyrailo, GE Global Research (United States)
Marko Baller, GE Global Research (Germany)

Published in SPIE Proceedings Vol. 7322:
Photonic Microdevices/Microstructures for Sensing
Hai Xiao; Xudong Fan; Anbo Wang, Editor(s)

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