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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17520–17527

High-precision molecular interrogation by direct referencing of a quantum-cascade-laser to a near-infrared frequency comb

D. Gatti, A. Gambetta, A. Castrillo, G. Galzerano, P. Laporta, L. Gianfrani, and M. Marangoni  »View Author Affiliations

Optics Express, Vol. 19, Issue 18, pp. 17520-17527 (2011)

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This work presents a very simple yet effective way to obtain direct referencing of a quantum-cascade-laser at 4.3 μm to a near-IR frequency-comb. Precise tuning of the comb repetition-rate allows the quantum-cascade-laser to be scanned across absorption lines of a CO2 gaseous sample and line profiles to be acquired with extreme reproducibility and accuracy. By averaging over 50 acquisitions, line-centre frequencies are retrieved with an uncertainty of 30 kHz in a linear interaction regime. The extension of this methodology to other lines and molecules, by the use of widely tunable extended-cavity quantum-cascade-lasers, paves the way to a wide availability of high-quality and traceable spectroscopic data in the most crucial region for molecular detection and interrogation.

© 2011 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6390) Spectroscopy : Spectroscopy, molecular

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 28, 2011
Revised Manuscript: July 21, 2011
Manuscript Accepted: August 2, 2011
Published: August 22, 2011

D. Gatti, A. Gambetta, A. Castrillo, G. Galzerano, P. Laporta, L. Gianfrani, and M. Marangoni, "High-precision molecular interrogation by direct referencing of a quantum-cascade-laser to a near-infrared frequency comb," Opt. Express 19, 17520-17527 (2011)

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