Physics – Condensed Matter – Materials Science
Scientific paper
2003-10-08
Physics
Condensed Matter
Materials Science
Style changes and spelling corrections; removed redundant figure
Scientific paper
10.1063/1.1728312
We have developed a new 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.
Black Eric D.
Grudinin Ivan S.
Libbrecht Kenneth G.
Rao Shanti R.
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