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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 28 — Oct. 1, 2012
  • pp: 6844–6847

Study on the absorption uniformity of optical thin films based on the photothermal detuning technique

Honggang Hao, Ao Zhou, and Min Rao  »View Author Affiliations


Applied Optics, Vol. 51, Issue 28, pp. 6844-6847 (2012)
http://dx.doi.org/10.1364/AO.51.006844


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Abstract

Absorption loss in optical components, particularly in optical coatings, is a limiting factor in high-power laser applications. The uniformity of optical coatings becomes more and more important as large-diameter optical devices are used widely. In this paper, the photothermal detuning technique used for absorption uniformity measurement of optical thin films is developed for the first time. Experiments are conducted with a highly reflective coating used in 514 nm to measure the photothermal detuning signal and to evaluate the absorption at 514 nm by detecting the spectral shift with a probe beam at a wavelength of 632.8 nm. The relative absorption at different points on the sample surface can be measured by moving the sample two-dimensionally, and we use the measured data to make the absorption image. The results show that the designed experimental system can be used to analyze the absorption uniformity of optical coatings. The obtained images reflect the absorption uniformity of the sample well. The absorption uniformities of the two samples analyzed in this experiment are different. The film coated on fused silica is better. The research provides a powerful and convenient tool for absorption uniformity measurement of optical thin film.

© 2012 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:
Thin Films

History
Original Manuscript: July 12, 2012
Manuscript Accepted: August 27, 2012
Published: September 27, 2012

Citation
Honggang Hao, Ao Zhou, and Min Rao, "Study on the absorption uniformity of optical thin films based on the photothermal detuning technique," Appl. Opt. 51, 6844-6847 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-28-6844

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