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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 20 — Oct. 15, 2007
  • pp: 3047–3049

Oxygen isotope ratio measurements in C O 2 by means of a continuous-wave quantum cascade laser at 4.3 μ m

Antonio Castrillo, Giovanni Casa, and Livio Gianfrani  »View Author Affiliations

Optics Letters, Vol. 32, Issue 20, pp. 3047-3049 (2007)

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A mid-infrared laser spectrometer was developed for simultaneous high-precision O 18 O 16 and O 17 O 16 isotope ratio measurements in carbon dioxide. A continuous-wave, liquid-nitrogen cooled, distributed feedback quantum cascade laser, working at a wavelength of 4.3 μ m , was used to probe C 12 O 2 16 , O 16 C 12 O 18 , and O 16 C 12 O 17 lines at 2311.8 cm 1 . High sensitivity was achieved by means of wavelength modulation spectroscopy with second-harmonic detection. The experimental reproducibility in the short and long terms was deeply investigated through the accurate analysis of a large number of spectra. In particular, we found a short term precision of 0.5 and 0.6 , respectively, for O 18 O 16 and O 17 O 16 isotope ratios. The occurrence of systematic deviations is also discussed.

© 2007 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6390) Spectroscopy : Spectroscopy, molecular

ToC Category:

Original Manuscript: August 6, 2007
Manuscript Accepted: September 7, 2007
Published: October 12, 2007

Antonio Castrillo, Giovanni Casa, and Livio Gianfrani, "Oxygen isotope ratio measurements in CO2 by means of a continuous-wave quantum cascade laser at 4.3 μm," Opt. Lett. 32, 3047-3049 (2007)

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