PREPRINT
57A3CDAE-5074-4647-B66F-5593E1B45165

Laboratory development of a heterodyne interferometric system for translation and tilt measurement of the proof mass in the space gravitational wave detection

Xin Xu, Yidong Tan
arXiv:2207.06420

Submitted on 13 July 2022

Abstract

Laser heterodyne interferometry plays a key role in the proof mass's monitor and control by measuring its multiple degrees of freedom motions in the Space Gravitational Wave Detection. Laboratory development of polarization-multiplexing heterodyne interferometer (PMHI) using quadrant photodetectors (QPD) is presented in this paper, intended for measuring the translation and tilt of a proof mass. The system is of symmetric design, which can expand to five degrees of freedom measurements based on polarization-multiplexing and differential wavefront sensing (DWS). The ground-simulated experimental results demonstrate that a measurement noise of 3 pm/Hz1/2 and 2 nrad/Hz1/2 at 1 Hz have been achieved respectively. The tilt-to-length error is dominated by geometric misalignment for the current system, the coupling of which is at micrometer level within a tilt range of 1000 {\mu}rad.

Preprint

Comment: 10 pages, 11 figures

Subjects: Astrophysics - Instrumentation and Methods for Astrophysics; Physics - Instrumentation and Detectors; Physics - Optics

URL: https://arxiv.org/abs/2207.06420