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  Geometric tilt-to-length coupling in precision interferometry: mechanisms and analytical descriptions

Hartig, M.-S., Schuster, S., & Wanner, G. (2022). Geometric tilt-to-length coupling in precision interferometry: mechanisms and analytical descriptions. Journal of Optics, 24(6): 065601. doi:10.1088/2040-8986/ac675e.

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Hartig, Marie-Sophie1, Author              
Schuster, Sönke1, Author              
Wanner, Gudrun1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Instrumentation and Detectors, physics.ins-det, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Optics, physics.optics
 Abstract: Tilt-to-length coupling is a technical term for the cross-coupling of angular or lateral jitter into an interferometric phase signal. It is an important noise source in precision interferometers and originates either from changes in the optical path lengths or from wavefront and clipping effects. Within this paper, we focus on geometric TTL coupling and categorize it into a number of different mechanisms for which we give analytic expressions. We then show that this geometric description is not always sufficient to predict the TTL coupling noise within an interferometer. We, therefore, discuss how understanding the geometric effects allows TTL noise reduction already by smart design choices. Additionally, they can be used to counteract the total measured TTL noise in a system. The presented content applies to a large variety of precision interferometers, including space gravitational wave detectors like LISA.

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 Dates: 2022-01-072022
 Publication Status: Published in print
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 Identifiers: arXiv: 2201.06943
DOI: 10.1088/2040-8986/ac675e
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Title: Journal of Optics
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Pages: - Volume / Issue: 24 (6) Sequence Number: 065601 Start / End Page: - Identifier: -