Fibre lasers for photo-acoustic gas spectroscopy

Norhana Arsad, George Stewart

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report here on the use of fiber lasers for recovery of gas absorption line shapes by photo-acoustic spectroscopy. We demonstrate the principle of operation using an erbium-doped fiber, stabilized using a length of un-pumped doped fibre as a saturable absorber. Intensity modulation of the laser output for phase sensitive detection is performed by modulation of the pump current while the wavelength is scanned through the absorption line by a PZT on a fibre Bragg grating. This avoids the distortions that arise in recovered signals due to simultaneous wavelength and intensity modulation, as is the case with conventional DFB diode lasers. Furthermore, the near zero off-line signals with photo-acoustic spectroscopy means that high modulation indices can be used with simple intensity modulation of the fiber laser output. The modulation frequency is set to the acoustic resonance frequency of the gas cell and measurements are made on the P17 absorption line of acetylene at 1535.39nm showing good agreement with the theoretical line-shape profile.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7753
DOIs
Publication statusPublished - 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, ON
Duration: 15 May 201119 May 2011

Other

Other21st International Conference on Optical Fiber Sensors
CityOttawa, ON
Period15/5/1119/5/11

Fingerprint

gas spectroscopy
Fiber Laser
Fiber lasers
fiber lasers
Spectroscopy
Modulation
Gases
Acoustics
modulation
acoustics
Line
Photoacoustic spectroscopy
photoacoustic spectroscopy
Absorption
laser outputs
fibers
line shape
Erbium
Wavelength
DFB Laser

Keywords

  • erbium-doped fibre lasers
  • fibre sensors
  • gas sensors
  • laser spectroscopy
  • photo-acoustic spectroscopy

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Arsad, N., & Stewart, G. (2011). Fibre lasers for photo-acoustic gas spectroscopy. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7753). [77533L] https://doi.org/10.1117/12.884944

Fibre lasers for photo-acoustic gas spectroscopy. / Arsad, Norhana; Stewart, George.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7753 2011. 77533L.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Arsad, N & Stewart, G 2011, Fibre lasers for photo-acoustic gas spectroscopy. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7753, 77533L, 21st International Conference on Optical Fiber Sensors, Ottawa, ON, 15/5/11. https://doi.org/10.1117/12.884944
Arsad N, Stewart G. Fibre lasers for photo-acoustic gas spectroscopy. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7753. 2011. 77533L https://doi.org/10.1117/12.884944
Arsad, Norhana ; Stewart, George. / Fibre lasers for photo-acoustic gas spectroscopy. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7753 2011.
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