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arXiv · 2410.23887

Demonstration of tilt sensing using a homodyne quadrature interferometric translational sensor

Koji Nagano·Karera Mori·Kiwamu Izumi
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Abstract

Future gravitational wave observation in space will demand improvement in the sensitivity of the local sensor for the drag-free control. This paper presents the proposal, design, and demonstration of a new laser interferometric sensor named Quadrature Interferometric Metrology of Translation and Tilt (QUIMETT) for the drag-free local sensor. QUIMETT enables simultaneous measurements of both translational displacement and tilts of a reflective object with a single interferometer package. QUIMETT offers a characteristic feature where the sensitivity to tilt is independent of the interference condition while maintaining the ability to measure the translational displacement for a range greater than the laser wavelength. The tilt-sensing function has been demonstrated in a prototype experiment. The tilt sensitivity remained unchanged in different interference conditions and stayed at 10 nrad/Hz$^{1/2}$ at 0.1 Hz.

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Koji Nagano, Karera Mori, Kiwamu Izumi. 2024-10-31. Demonstration of tilt sensing using a homodyne quadrature interferometric translational sensor. https://doi.org/10.1088/1361-6382%2Fadd3b4

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