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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 5 — Mar. 1, 2010
  • pp: 4845–4858

High-speed off-axis Cavity Ring-Down Spectroscopy with a re-entrant configuration for spectral resolution enhancement

Jérémie Courtois, Ajmal Khan Mohamed, and Daniele Romanini  »View Author Affiliations


Optics Express, Vol. 18, Issue 5, pp. 4845-4858 (2010)
http://dx.doi.org/10.1364/OE.18.004845


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Abstract

Monitoring of changing samples by Cavity Ring-Down Spectroscopy (CRDS) is possible using fast frequency scans of the laser and/or the cavity resonance. Mode-matched cavity excitation improves performance of fast CRDS but data-points result separated by the cavity Free Spectral Range (FSR): low pressure samples demand long cavities. We demonstrate fast CRDS with off-axis injection of a “re-entrant” resonator yielding FSR/N data-points separation. Our N = 4 short-cavity setup is found to perform well compared with other fast-CRDS implementations. Interestingly, the intrinsic chirped ringing affecting ring-down signals in mode-matched fast-CRDS disappear with off-axis injection. This is due to a fine splitting of the re-entrant-cavity degenerate groups of modes by astigmatism.

© 2010 OSA

OCIS Codes
(280.3420) Remote sensing and sensors : Laser sensors
(300.6190) Spectroscopy : Spectrometers

ToC Category:
Spectroscopy

History
Original Manuscript: September 21, 2009
Revised Manuscript: December 1, 2009
Manuscript Accepted: January 5, 2010
Published: February 24, 2010

Citation
Jérémie Courtois, Ajmal Khan Mohamed, and Daniele Romanini, "High-speed off-axis Cavity Ring-Down Spectroscopy with a re-entrant configuration for spectral resolution enhancement," Opt. Express 18, 4845-4858 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-5-4845


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