Methods for simulating the readout of lengths and angles in laser interferometers with Gaussian beams |
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Authors: | Gudrun Wanner Gerhard Heinzel Evgenia Kochkina Christoph Mahrdt Benjamin S Sheard Sönke Schuster Karsten Danzmann |
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Institution: | a Max-Planck-Institute for Gravitational Physics (Albert-Einstein-Institute), Callinstr. 38, D-30167 Hanover, Germany b QUEST Centre of Quantum Engineering and Space-Time Research, Leibniz University of Hanover, Hanover, Germany |
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Abstract: | In this paper methods to simulate the signals in laser interferometers are proposed. The central part deals with the computation of the photocurrent, subsequent phase demodulation and finally the generation of interferometer signals, such as the longitudinal phase readout, differential wavefront sensing signal, differential power sensing and contrast. Here, fundamental Gaussian beams without astigmatism are assumed. The methods are validated in several examples by comparison with experimental data, with analytical results as well as with an intuitively predictable system. |
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Keywords: | Interferometry Simulation Differential wavefront sensing Phase demodulation Heterodyne Homodyne |
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