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- W3102127941 abstract "The arm length and the isolation in space enable the Laser Interferometer Space Antenna (LISA) to probe for signals unattainable on the ground, opening a window to the subhertz gravitational-wave universe. The coupling of unavoidable angular spacecraft jitter into the longitudinal displacement measurement, an effect known as tilt-to-length (TTL) coupling, is critical for realizing the required sensitivity of $mathrm{picometer}/sqrt{mathrm{Hz}}$. An ultrastable interferometer test bed has been developed in order to investigate this issue and validate mitigation strategies in a setup representative of LISA and in this paper it is operated in the long-arm interferometer configuration. The test bed is fitted with a flat-top beam generator to simulate the beam received by a LISA spacecraft. We demonstrate a reduction of TTL coupling between this flat-top beam and a Gaussian reference beam via the introduction of two- and four-lens imaging systems. TTL coupling factors below $ifmmodepmelsetextpmfi{}25phantom{rule{0.2em}{0ex}}ensuremath{mu}mathrm{m}/mathrm{rad}$ for beam tilts within $ifmmodepmelsetextpmfi{}300phantom{rule{0.2em}{0ex}}ensuremath{mu}mathrm{rad}$ are obtained by careful optimization of the system. Moreover, we show that the additional TTL coupling due to lateral-alignment errors of elements of the imaging system can be compensated by introducing lateral shifts of the detector and vice versa. These findings help validate the suitability of this noise-reduction technique for the LISA long-arm interferometer." @default.
- W3102127941 created "2020-11-23" @default.
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- W3102127941 date "2020-07-10" @default.
- W3102127941 modified "2023-10-10" @default.
- W3102127941 title "Optical Suppression of Tilt-to-Length Coupling in the LISA Long-Arm Interferometer" @default.
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- W3102127941 doi "https://doi.org/10.1103/physrevapplied.14.014030" @default.
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