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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 5, Iss. 14 — Nov. 16, 2010

Offset-frequency locking of extended-cavity diode lasers for precision spectroscopy of water at 1.38 μm

A. Castrillo, E. Fasci, G. Galzerano, G. Casa, P. Laporta, and L. Gianfrani  »View Author Affiliations

Optics Express, Vol. 18, Issue 21, pp. 21851-21860 (2010)

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We describe a continuous-wave diode laser spectrometer for water-vapour precision spectroscopy at 1.38 μm. The spectrometer is based upon the use of a simple scheme for offset-frequency locking of a pair of extended-cavity diode lasers that allows to achieve high levels of accuracy and reproducibility in measuring molecular absorption. When locked to the master laser with an offset frequency of 1.5 GHz, the slave laser exhibits residual frequency fluctuations of ∼ 1 kHz over a time interval of 25 minutes, for a 1-s integration time. The slave laser could be continuously tuned up to 3 GHz, the scan showing relative deviations from linearity below the 10−6 level. Simultaneously, a capture range of the order of 1 GHz was obtained. Quantitative spectroscopy was also demonstrated by accurately determining relevant spectroscopic parameters for the 22,1→22,0 line of the H218O ν1+ν3 band at 1384.6008 nm.

© 2010 Optical Society of America

OCIS Codes
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6390) Spectroscopy : Spectroscopy, molecular
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:

Original Manuscript: July 30, 2010
Revised Manuscript: September 23, 2010
Manuscript Accepted: September 23, 2010
Published: September 29, 2010

Virtual Issues
Vol. 5, Iss. 14 Virtual Journal for Biomedical Optics

A. Castrillo, E. Fasci, G. Galzerano, G. Casa, P. Laporta, and L. Gianfrani, "Offset-frequency locking of extended-cavity diode lasers for precision spectroscopy of water at 1.38 μm," Opt. Express 18, 21851-21860 (2010)

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