The photothermal effect in interferometers

Details The photothermal effect in interferometers The photothermal effect in interferometers

2002-10-09

arxiv.org/abs/gr-qc/0210029v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

26 pages, 13 figures

Scientific paper

We have measured the photothermal effect in a single cross-polarized interferometer at audio frequencies (5 Hz - 4 kHz). In a Fabry-Perot interferometer, light in one polarization is chopped to periodically heat the interferometer mirrors, while light in the orthogonal polarization measures the mirror length changes. Tests of a polished solid metal mirror show good agreement with relevant proposed theories by Braginsky et al. ["Thermodynamical fluctuations and photo-thermal shot noise in gravitational wave antennae," Physics Letters A 264, 1-10 (1999)] and Cerdonio et al. ["Thermoelastic effects at low temperatures and quantum limits in displacement measurements," Physical Review D 63 082003 (2001)] describing uncoated optics.

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