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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 2 — Jan. 10, 2008
  • pp: 188–194

Photothermal detuning for absorption measurement of optical coatings

Honggang Hao and Bincheng Li  »View Author Affiliations

Applied Optics, Vol. 47, Issue 2, pp. 188-194 (2008)

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A simple and sensitive photothermal technique—photothermal detuning, in which the spectral shift of an optical coating caused by absorption-induced temperature rise is used to measure the photothermal signal—and its application for the absorption measurement of coated optical components are developed theoretically and experimentally in detail for the first time to the best of our knowledge. The theoretical description of the photothermal detuning signal with a continuous-wave modulated laser beam excitation is presented. Experiments are conducted with a highly reflective coating used at 532   nm to measure the photothermal detuning signal and to evaluate the absorption at 532   nm by detecting the spectral shift with a probe beam at a wavelength of 632.8   nm . By optimizing the incident angle of the probe beam, the amplitude of the photothermal detuning signal is maximized. Good agreement is obtained between the experimental results and the theoretical predictions.

© 2008 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(310.1620) Thin films : Interference coatings
(350.5340) Other areas of optics : Photothermal effects

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 3, 2007
Manuscript Accepted: November 14, 2007
Published: January 8, 2008

Honggang Hao and Bincheng Li, "Photothermal detuning for absorption measurement of optical coatings," Appl. Opt. 47, 188-194 (2008)

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