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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 4 — Feb. 1, 2011
  • pp: A11–A19

Automated broad tuning of difference frequency sources for spectroscopic studies

Michele Gianella and Markus W. Sigrist  »View Author Affiliations

Applied Optics, Vol. 50, Issue 4, pp. A11-A19 (2011)

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Transmission spectroscopy over large spectral ranges ( > 100 cm 1 ) generally requires a reference measurement to be taken separately from the sample scan. The ratio of the two measurements (i.e., the transmittance) is therefore susceptible to baseline changes that occur between the recording of the two spectra. The origins of relatively strong baseline changes ( 1 % ) of a difference-frequency- generation-based laser spectrometer (tuning range 2900 3144 cm 1 , 150 μW average power) were investigated and a method for minimizing them by improving reproducibility and reducing measurement time is presented. The new method was tested for a gas mixture and the sensitivity for broad absorption features was determined as 5 × 10 3 minimum measurable absorbance for a total scan duration of 70 min .

© 2011 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:

Original Manuscript: June 9, 2010
Revised Manuscript: September 10, 2010
Manuscript Accepted: September 10, 2010
Published: October 14, 2010

Michele Gianella and Markus W. Sigrist, "Automated broad tuning of difference frequency sources for spectroscopic studies," Appl. Opt. 50, A11-A19 (2011)

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