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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 25 — Dec. 10, 2007
  • pp: 16540–16545

Sensitive multiplex spectroscopy in the molecular fingerprint 2.4 µm region with a Cr2+:ZnSe femtosecond laser

E. Sorokin, I. T. Sorokina, J. Mandon, G. Guelachvili, and N. Picqué  »View Author Affiliations


Optics Express, Vol. 15, Issue 25, pp. 16540-16545 (2007)
http://dx.doi.org/10.1364/OE.15.016540


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Abstract

An ultrashort-pulse Cr2+:ZnSe laser is a novel broadband source for sensitive high resolution molecular spectroscopy. A 130-fs pulse allows covering of up to 380 cm-1 spectral domain around 2.4 µm which is analyzed simultaneously with a 0.12 cm-1 (3.6 GHz) resolution by a Fourier-transform spectrometer. Recorded in 13 s, from 70-cm length absorption around 4150 cm-1, acetylene and ammonia spectra exhibit a 3800 signal-to-noise ratio and a 2.4·10-7 cm-1·Hz-1/2 noise equivalent absorption coefficient at one second averaging per spectral element, suggesting a 0.2 ppbv detection level for HF molecule. With the widely practiced classical tungsten lamp source instead of the laser, identical spectra would have taken more than one hour.

© 2007 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.7090) Lasers and laser optics : Ultrafast lasers
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6390) Spectroscopy : Spectroscopy, molecular
(320.0320) Ultrafast optics : Ultrafast optics

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 15, 2007
Revised Manuscript: November 20, 2007
Manuscript Accepted: November 24, 2007
Published: November 29, 2007

Citation
E. Sorokin, I. T. Sorokina, J. Mandon, G. Guelachvili, and N. Picque, "Sensitive multiplex spectroscopy in the molecular fingerprint 2.4 μm region with a Cr2+:ZnSe femtosecond laser," Opt. Express 15, 16540-16545 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-25-16540


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References

  1. J. Mandon, G. Guelachvili, N. Picqué, F. Druon, and P. Georges, "Femtosecond laser Fourier transform absorption spectroscopy," Opt. Lett. 32, 1677-1679 (2007). [CrossRef] [PubMed]
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