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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 10, Iss. 19 — Sep. 23, 2002
  • pp: 1033–1042

Mode–locked cavity–enhanced absorption spectroscopy

Titus Gherman and Daniele Romanini  »View Author Affiliations

Optics Express, Vol. 10, Issue 19, pp. 1033-1042 (2002)

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We demonstrate the principle of cavity enhanced absorption with femtosecond modelocked lasers. The wide spectral coverage allowed by these sources makes this a promising high–sensitivity linear absorption technique. The uniformity of the modelocked frequency comb is the feature allowing effective injection of a high finesse cavity. The smooth and stable laser spectral profile guarantees a good background for the intracavity sample absorption spectrum, recorded by a spectrograph and a linear detector array. With a modelocked Ti:Sa laser and a cavity of finesse F ≃420 (F/π is the enhancement factor) we obtain a 4 nm section of a weak overtone band in 40 ms with 0.2cm-1resolution, and a detection limit of 2 × 10-7/cm/√Hz.

© 2002 Optical Society of America

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.4780) Lasers and laser optics : Optical resonators
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
Research Papers

Original Manuscript: July 29, 2002
Revised Manuscript: September 19, 2002
Published: September 23, 2002

Titus Gherman and Daniele Romanini, "Modelocked Cavity--Enhanced Absorption Spectroscopy," Opt. Express 10, 1033-1042 (2002)

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