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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 4 — Feb. 1, 2014
  • pp: A16–A20

Enhanced laser-induced deflection measurements for low absorbing highly reflecting mirrors

Christian Mühlig, Simon Bublitz, and Wolfgang Paa  »View Author Affiliations

Applied Optics, Vol. 53, Issue 4, pp. A16-A20 (2014)

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A new concept enhances the capability of photo-thermal absorption measurements with transversal probe beam guiding by overcoming drawbacks such as a lack of sensitivity for materials with low photo-thermal response and/or round substrate geometry. The sandwich concept using the laser-induced deflection technique is introduced and tested for the investigation of highly reflecting (HR) coatings. The idea behind the sandwich concept is based on the decoupling of the optical materials for the pump and probe beams. This is realized by either placing a HR coated rectangular substrate in between two optical (sandwich) plates or attaching a HR coated thin round substrate onto one optical plate. For both configurations, the sandwich concept results in a strong increase in sensitivity for the measurement of HR coatings deposited onto photo-thermally insensitive substrates. Experiments reveal that for a CaF 2 substrate, up to two orders of magnitude enhancement in sensitivity can be achieved.

© 2013 Optical Society of America

OCIS Codes
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(300.1030) Spectroscopy : Absorption
(310.1620) Thin films : Interference coatings

Original Manuscript: August 26, 2013
Manuscript Accepted: September 21, 2013
Published: October 22, 2013

Christian Mühlig, Simon Bublitz, and Wolfgang Paa, "Enhanced laser-induced deflection measurements for low absorbing highly reflecting mirrors," Appl. Opt. 53, A16-A20 (2014)

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