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Applied Optics

Applied Optics


  • Vol. 36, Iss. 27 — Sep. 20, 1997
  • pp: 7046–7058

Photothermal lensing detection: theory and experiment

Qifang He, Reeta Vyas, and Rajendra Gupta  »View Author Affiliations

Applied Optics, Vol. 36, Issue 27, pp. 7046-7058 (1997)

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Photothermal lensing signal shapes are experimentally investigated and compared with those predicted theoretically in our earlier paper. The investigation included flowing and stationary media and pulsed and cw excitations. Good qualitative agreement between theory and experiment is found. Since the lensing signal is almost always accompanied by a deflection signal, the influence of the deflection signal on the detection of lensing signal is investigated. For a perfectly aligned detection geometry the influence of the deflection signal on the lensing signal is negligible, but in the presence of misalignments a significant amount of deflection signal could be superimposed on the lensing signal. The effect of lensing on the deflection signal is also been considered. The effect of the finite size of the probe beam on the lensing signals is also investigated.

© 1997 Optical Society of America

Original Manuscript: October 24, 1996
Revised Manuscript: February 26, 1997
Published: September 20, 1997

Qifang He, Reeta Vyas, and Rajendra Gupta, "Photothermal lensing detection: theory and experiment," Appl. Opt. 36, 7046-7058 (1997)

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  1. See for example, Progress in Photothermal and Photoacoustic Science and Technology, A. Mandelis, ed. (Elsevier, New York, 1992), Vol. 1, and other volumes in this series.
  2. See, for example, Proceedings of the Ninth International Confererence on Photoacoustic and Photothermal Phenomena, Progress in Natural Science, Supplement to Vol. 6 (Taylor & Francis, Washington, D.C., 1996).
  3. R. Vyas, R. Gupta, “Photothermal lensing spectroscopy in a flowing medium: theory,” Appl. Opt. 27, 4701–4711 (1988). [CrossRef] [PubMed]
  4. R. Gupta “The theory of photothermal effect in fluids” in Photothermal Investigations of Solids and Fluids, J. A. Sell, ed., (Academic, New York, 1989), pp. 81–126.
  5. A. Rose, R. Vyas, R. Gupta, “Pulsed Photothermal Deflection spectroscopy in a flowing medium: a quantitative investigation,” Appl. Opt. 25, 4626–4643 (1986). [CrossRef] [PubMed]
  6. Reeta Vyas, B. Monson, Y.-X. Nie, R. Gupta, “Continuous wave photothermal deflection spectroscopy in a flowing medium,” Appl. Opt. 27, 3914–3920 (1988). [CrossRef] [PubMed]
  7. J. M. Khosrofian, B. A. Garetz, “Measurement of a Gaussian laser beam diameter through the direct inversion of knife-edge data,” Appl. Opt. 22, 3406–3410 (1983). [CrossRef] [PubMed]
  8. Q. He, “Photothermal spectroscopy of fluid and solid samples,” Ph.D. Dissertation (University of Arkansas, Fayetteville, Ark., 1995).

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