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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 31, Iss. 15 — May. 20, 1992
  • pp: 2669–2677

Cavity-enhanced photothermal spectroscopy: dynamics, sensitivity, and spatial resolution

H. A. Schuessler, S. H. Chen, Z. Rong, Z. C. Tang, and E. C. Benck  »View Author Affiliations


Applied Optics, Vol. 31, Issue 15, pp. 2669-2677 (1992)
http://dx.doi.org/10.1364/AO.31.002669


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Abstract

The spectrally resolved low-level absorption of thin films and of solid and liquid surfaces was measured by cavity-enhanced photothermal spectroscopy. The technique is ultrasensitive and can determine surface-specific absorbances α(ω) ~ 10−6 at a power density of 104W/cm2. Both cases of continuous wave and modulated laser light absorption were studied experimentally and are interpreted theoretically. It is shown that it is possible to achieve a spatial resolution of absorbance variations in the few-micrometer range. The thermal diffusivity can also be simultaneously measured by observing the time evolution of the surface temperature during laser irradiation.

© 1992 Optical Society of America

History
Original Manuscript: January 24, 1991
Published: May 20, 1992

Citation
H. A. Schuessler, S. H. Chen, Z. Rong, Z. C. Tang, and E. C. Benck, "Cavity-enhanced photothermal spectroscopy: dynamics, sensitivity, and spatial resolution," Appl. Opt. 31, 2669-2677 (1992)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-31-15-2669

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