Reducing tilt-to-length coupling for the LISA test mass interferometer

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Abstract

Objects sensed by laser interferometers are usually not stable in position or orientation. This angular instability can lead to a coupling of angular tilt to apparent longitudinal displacement - tilt-to-length coupling (TTL). In LISA this is a potential noise source for both the test mass interferometer and the long-arm interferometer. We have experimentally investigated TTL coupling in a setup representative for the LISA test mass interferometer and used this system to characterise two different imaging systems (a two-lens design and a four-lens design) both designed to minimise TTL coupling. We show that both imaging systems meet the LISA requirement of ±25 μm rad-1 for interfering beams with relative angles of up to ±300 μrad. Furthermore, we found a dependency of the TTL coupling on beam properties such as the waist size and location, which we characterised both theoretically and experimentally.

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Tröbs, M., Schuster, S., Lieser, M., Zwetz, M., Chwalla, M., Danzmann, K., … Ward, H. (2018). Reducing tilt-to-length coupling for the LISA test mass interferometer. Classical and Quantum Gravity, 35(10). https://doi.org/10.1088/1361-6382/aab86c

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