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Applied Optics

Applied Optics


  • Vol. 44, Iss. 15 — May. 20, 2005
  • pp: 3110–3116

Detection of photothermal deflection signals with conjugate masks

Anup Sharma, Gabriel Ycas, Zeyad Alahmed, and Rajendra Gupta  »View Author Affiliations

Applied Optics, Vol. 44, Issue 15, pp. 3110-3116 (2005)

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A new detection technique for photothermal deflection spectroscopy and photoacoustic deflection spectroscopy is presented. The technique uses a pair of matched multiple slits placed in the path of the probe beam and oriented to block the probe light from the detector in the absence of a deflection signal. Significant improvement in the signal-to-noise ratio and in the frequency bandwidth compared with those available with current techniques is demonstrated.

© 2005 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(300.6430) Spectroscopy : Spectroscopy, photothermal

Original Manuscript: August 13, 2004
Revised Manuscript: December 21, 2004
Manuscript Accepted: January 12, 2005
Published: May 20, 2005

Anup Sharma, Gabriel Ycas, Zeyad Alahmed, and Rajendra Gupta, "Detection of photothermal deflection signals with conjugate masks," Appl. Opt. 44, 3110-3116 (2005)

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  1. J. A. Sell, ed., Photothermal Investigations of Solids and Fluids (Academic, New York, 1989).
  2. A. Mandelis, ed., Principles and Perspectives of Photothermal and Photoacoustic Phenomena, Vol. 1 of Progress in Photothermal and Photoacoustic Science and Technology (North-Holland, New York, 1991).
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  9. Y. Li, R. Gupta, “Measurement of absolute minority species concentration and temperature in a flame by the photothermal deflection spectroscopy technique,” Appl. Opt. 42, 2226–2234 (2003). [CrossRef] [PubMed]
  10. See, for example E. Hecht, A. Zajac, Optics (Addison-Wesley, Reading, Mass., 1974).
  11. A. Rose, “The development of pulsed photoacoustic and photothermal deflection spectroscopy as diagnostic tools for combustion,” Ph.D. dissertation (University of Arkansas, Fayetteville, 1986).

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