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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 20 — Oct. 15, 2006
  • pp: 3040–3042

Doppler-free saturated-absorption spectroscopy of C O 2 at 4.3 μ m by means of a distributed feedback quantum cascade laser

A. Castrillo, E. De Tommasi, L. Gianfrani, L. Sirigu, and J. Faist  »View Author Affiliations


Optics Letters, Vol. 31, Issue 20, pp. 3040-3042 (2006)
http://dx.doi.org/10.1364/OL.31.003040


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Abstract

We report the application of a cw distributed feedback quantum cascade laser to Lamb-dip spectroscopy of C O 2 at 4.3 μ m . With the laser operating in the free-running mode, we observed the sub-Doppler profile of the P ( 28 ) line of the ( 0 , 1 1 , 0 ) ( 0 , 1 1 , 1 ) hot band by implementing a pump–probe scheme and using wavelength modulation spectroscopy for highly sensitive detection of saturated absorption signals. We investigated the main limitations to the observation of a narrow resonance, with particular attention to the effect of the laser current noise. We determined the intrinsic laser emission width, which was found to be approximately 3.4 MHz (FWHM) for an observation time of 200 ms .

© 2006 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6460) Spectroscopy : Spectroscopy, saturation

ToC Category:
Spectroscopy

History
Original Manuscript: July 14, 2006
Manuscript Accepted: July 24, 2006
Published: September 25, 2006

Citation
A. Castrillo, E. De Tommasi, L. Gianfrani, L. Sirigu, and J. Faist, "Doppler-free saturated-absorption spectroscopy of CO2 at 4.3 μm by means of a distributed feedback quantum cascade laser," Opt. Lett. 31, 3040-3042 (2006)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-31-20-3040


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References

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