Photonic bandgap fiber-enabled Raman detection of nitrogen gas

Rui Chen; Peter J. Codella; Renato Guida; Anis Zribi; Alexey Vert; Radislav Potyrailo; Marko Baller

doi:10.1117/12.817823

29 April 2009 Photonic bandgap fiber-enabled Raman detection of nitrogen gas

Rui Chen, Peter J. Codella, Renato Guida, Anis Zribi, Alexey Vert, Radislav Potyrailo, Marko Baller

Proceedings Volume 7322, Photonic Microdevices/Microstructures for Sensing; 73220N (2009) https://doi.org/10.1117/12.817823
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

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.

Citation Download Citation

Rui Chen, Peter J. Codella, Renato Guida, Anis Zribi, Alexey Vert, Radislav Potyrailo, and Marko Baller "Photonic bandgap fiber-enabled Raman detection of nitrogen gas", Proc. SPIE 7322, Photonic Microdevices/Microstructures for Sensing, 73220N (29 April 2009); https://doi.org/10.1117/12.817823

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