The Response of Laser Interferometric Gravitational Wave Detectors Beyond the Eikonal Equation
arXiv:2103.03802 · doi:10.1088/1361-6382/ac15db
Abstract
The response of Michelson interferometers to weak plane gravitational waves is computed at one order of accuracy beyond the eikonal equation. The modulation of the electromagnetic field amplitude and polarisation are taken into account by solving the transport equations of geometrical optics with boundary conditions adapted to laser interferometry. Considering both DC and balanced homodyne readout schemes, explicit formulae for the interferometer output signals are derived. These signals comprise perturbations of the optical path length, frequency and amplitude, and are shown to be insensitive to polarisation perturbations.
arXiv comment40 pages, 6 figures
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