Thermoelastic effects at low temperatures and quantum limits in displacement measurements

Details Thermoelastic effects at low temperatures and quantum limits in displacement measurements Thermoelastic effects at low temperatures and quantum limits in displacement measurements

2000-09-29

arxiv.org/abs/gr-qc/0009104v2

Phys.Rev. D63 (2001) 082003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 2 figures

Scientific paper

10.1103/PhysRevD.63.082003

The displacement fluctuations of mirrors in optomechanical devices, induced via thermal expansion by temperature fluctuations due either to thermodynamic fluctuations or to fluctuations in the photon absorption, can be made smaller than quantum fluctuations, at the low temperatures, high reflectivities and high light powers needed to readout displacements at the standard quantum limit. The result is relevant for the design of quantum limited gravitational-wave detectors, both "interferometers" and "bars", and for experiments to study directly mechanical motion in the quantum regime.

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