Experimental measurement of the dynamic photothermal effect in Fabry-Perot cavities for gravitational wave detectors

Year: 2002

Authors: De Rosa M., Conti L., Cerdonio M., Pinard M., Marin F.

Autors Affiliation: Dipartimento di Fisica, Universitą di Firenze, INFN, Sezione di Firenze, LENS, Via Sansone 1, Sesto Fiorentino (FI), I-50019, Italy; Dipartimento di Fisica, Universitą di Padova, INFN, Sezione di Padova, Via Marzolo 8, Padova, I-35131, Italy; Laboratoire Kastler Brossel, 4 place, Jussieu, France

Abstract: We report the experimental observation of the frequency dependence of the photothermal effect. The measurements are performed by modulating the laser power absorbed by the mirrors of two high-finesse Fabry-Perot cavities. The results are very well described by a recently proposed theoretical model [M. Cerdonio, L. Conti, A. Heidmann, and M. Pinard, Phys. Rev. D 63, 082003 (2001)], confirming the correctness of such calculations. Our observations and quantitative characterization of the dynamic photothermal effect demonstrate its critical importance for interferometric displacement measurements towards the quantum limit, as those necessary for gravitational wave detection.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 89 (23)      Pages from: 237402-1  to: 237402-4

KeyWords: Density (optical); Frequencies; Interferometry; Mirrors; Numerical methods; Specific heat; Thermal conductivity, Fabry Perot cavities; Gravitational wave detectors; Optical cavities; Photothermal effect, Quantum optics
DOI: 10.1103/PhysRevLett.89.237402

Citations: 37
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