Photothermal and thermo-refractive effects in high reflectivity mirrors at room and cryogenic temperature

Year: 2012

Authors: Farsi A., Siciliani de Cumis M., Marino F., Marin F.

Autors Affiliation: Dipartimento di Fisica, Universita` di Firenze, INFN, Sezione di Firenze, and LENS Via Sansone 1,
I-50019 Sesto Fiorentino, Firenze, Italy

Abstract: Increasing requirements in the sensitivity of interferometric measurements is a common feature of several research fields, from gravitational wave detection to quantum optics. This motivates refined studies of high reflectivity mirrors and of noise sources that are tightly related to their structure. In this work we present an experimental characterization of photothermal and thermo-refractive effects in high reflectivity mirrors, i.e., of the variations in the position of their effective reflection plane due to weak residual power absorption. The measurements are performed by modulating the impinging power in the range 10 Hz divided by 100 kHz. The experimental results are compared with an expressly derived theoretical model in order to fully understand the phenomena and exploit them to extract useful effective thermo-mechanical parameters of the coating. The measurements are extended to cryogenic temperature, where most high sensitivity experiments are performed (or planned in future versions) and where characterizations of dielectric film coatings are still poor. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684626]

Journal/Review: JOURNAL OF APPLIED PHYSICS

Volume: 111 (4)      Pages from: 043101  to: 043101

More Information: This work was partially funded by the European Union ILIAS Project (No. RII3-CT-2003-506222).
DOI: 10.1063/1.3684626

Citations: 17
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