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Enhanced photothermal displacement spectroscopy for thin-film characterization using a Fabry-Perot resonator

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4 Author(s)
Black, Eric D. ; LIGO Project, California Institute of Technology, Mail Code 264-33, Pasadena, California 91125 ; Grudinin, I.S. ; Rao, Shanti R. ; Libbrecht, Kenneth G.

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We have developed a technique for photothermal displacement spectroscopy that is potentially orders of magnitude more sensitive than conventional methods. We use a single Fabry-Perot resonator to enhance both the intensity of the pump beam and the sensitivity of the probe beam. The result is an enhancement of the response of the instrument by a factor proportional to the square of the finesse of the cavity over conventional interferometric measurements. In this paper we present a description of the technique, and we discuss how the properties of thin films can be deduced from the photothermal response. As an example of the technique, we report a measurement of the thermal properties of a multilayer dielectric mirror similar to those used in interferometric gravitational wave detectors. © 2004 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:95 ,  Issue: 12 )

Date of Publication:

Jun 2004

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