Miniaturized photoacoustic trace gas sensing using a raman fiber amplifier

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This paper presents the development of a Raman fiber amplifier optical source with a maximum output power of 1.1 W centered around 1651 nm, and its application in miniaturized 3D printed photoacoustic spectroscopy (PAS) trace gas sensing of methane. The Raman amplifier has been constructed using 4.5 km of dispersion shifted fiber, a 1651 nm DFB seed laser and a commercial 4W EDFA pump. The suppression of stimulated Brillouin scattering (SBS) using a high frequency modulation of the seed laser is investigated for a range of frequencies, leading to an increase in optical output power of the amplifier and reduction of its noise content. The amplifier output was used as the source for a miniature PAS sensor by applying a second modulation to the seed laser at the resonant frequency of 15.2 kHz of the miniature 3D printed gas cell. For the targeted methane absorption line at 6057 cm-1 the sensor system performance and influence of the SBS suppression is characterized, leading to a detection limit (1σ) of 17 ppb methane for a signal acquisition time of 130 s, with a normalized noise equivalent absorption coefficient of 4.1•10-9 cm-1 W Hz-1/2 for the system.
LanguageEnglish
Pages3773-3780
Number of pages9
JournalJournal of Lightwave Technology
Volume33
Issue number18
Early online date10 Jun 2015
DOIs
Publication statusPublished - 15 Sep 2015

Fingerprint

Fiber amplifiers
Photoacoustic effect
Photoacoustic spectroscopy
Seed
Stimulated Brillouin scattering
seeds
Methane
photoacoustic spectroscopy
methane
amplifiers
fibers
Lasers
output
Gases
gases
retarding
lasers
Erbium doped fiber amplifiers
sensors
Sensors

Keywords

  • miniaturized fiber optic sensor
  • 3D printed photoacoustic trace gas sensor
  • raman fiber amplifier system
  • SBS suppression

Cite this

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title = "Miniaturized photoacoustic trace gas sensing using a raman fiber amplifier",
abstract = "This paper presents the development of a Raman fiber amplifier optical source with a maximum output power of 1.1 W centered around 1651 nm, and its application in miniaturized 3D printed photoacoustic spectroscopy (PAS) trace gas sensing of methane. The Raman amplifier has been constructed using 4.5 km of dispersion shifted fiber, a 1651 nm DFB seed laser and a commercial 4W EDFA pump. The suppression of stimulated Brillouin scattering (SBS) using a high frequency modulation of the seed laser is investigated for a range of frequencies, leading to an increase in optical output power of the amplifier and reduction of its noise content. The amplifier output was used as the source for a miniature PAS sensor by applying a second modulation to the seed laser at the resonant frequency of 15.2 kHz of the miniature 3D printed gas cell. For the targeted methane absorption line at 6057 cm-1 the sensor system performance and influence of the SBS suppression is characterized, leading to a detection limit (1σ) of 17 ppb methane for a signal acquisition time of 130 s, with a normalized noise equivalent absorption coefficient of 4.1•10-9 cm-1 W Hz-1/2 for the system.",
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Miniaturized photoacoustic trace gas sensing using a raman fiber amplifier. / Bauer, Ralf; Legg, Thomas; Mitchell, David; Flockhart, Gordon M. H.; Stewart, George; Johnstone, Walter; Lengden, Michael.

In: Journal of Lightwave Technology, Vol. 33, No. 18, 15.09.2015, p. 3773-3780.

Research output: Contribution to journalArticle

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