Experimental investigation of dynamic photo-thermal effect

Year: 2006

Authors: De Rosa M., Marin F., Marino F., Arcizet O., Heidmann A., Pinard M.

Autors Affiliation: INFN, Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (FI), Italy;
CNR – Istituto Nazionale di Ottica Applicata, Sez. di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Dipartimento di Fisica, Università di Firenze and LENS, Via Sansone 1, 50019 Sesto Fiorentino (FI), Italy;
Laboratoire Kastler Brossel, CNRS, Ecole Normale Supérieure, Univ. P. et M. Curie, Case 74, 4 place Jussieu, F75252 Paris, Cedex 05, France

Abstract: In an optical interferometer, a part of the laser power is absorbed by the mirrors and gives rise to surface displacements through thermal expansion. The position measurement sensitivity is, therefore, limited by the shot noise of the absorbed radiation. This phenomenon is called the photo-thermal effect and its typical frequency dependence and size can span over several orders of magnitude, depending on the mirror material and temperature, hence it is crucial to have an accurate model extending over such a large range. We present an extensive experimental investigation of dynamic photo-thermal effects, covering more than seven decades in frequency and including finite mirror size effects (low frequency) and coating effects (high frequency) and showing the dependence on the beam waist. A specific extension of the basic model is being developed that can well explain the results.

Journal/Review: CLASSICAL AND QUANTUM GRAVITY

Volume: 23 (8)      Pages from: S259  to: S266

KeyWords: photothermal effect; Fabry-Perot; gravitational wave detectors
DOI: 10.1088/0264-9381/23/8/S33

ImpactFactor: 2.773
Citations: 7
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-06
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