Coupling characterization and noise studies of the Optical Metrology System on-board the LISA Pathfinder Mission

Details Coupling characterization and noise studies of the Optical Metrology System on-board the LISA Pathfinder Mission Coupling characterization and noise studies of the Optical Metrology System on-board the LISA Pathfinder Mission

2010-06-10

arxiv.org/abs/1006.2122v1

Appl.Opt.49:5665-5677,2010

Physics

Instrumentation and Detectors

34 pages double-spaced 5 figures

Scientific paper

10.1364/AO.49.005665

In this article we describe the first investigations of the complete engineering model of the Optical Metrology System (OMS), a key subsystem of the LISA Pathfinder science mission to space. The latter itself is a technological precursor mission to LISA, a space-borne gravitational wave detector. At its core, the OMS consists of four heterodyne Mach Zehnder interferometers, a highly stable laser with external modulator and a phase-meter. It is designed to monitor and track the longitudinal motion and attitude of two floating test-masses in the optical reference frame with a (relative) precision in the picometer and nanorad range, respectively. We analyze sensor signal correlations and determine a physical sensor noise limit. The coupling parameters between motional degrees of freedom and interferometer signals are analytically derived and compared to measurements. We also measure adverse cross-coupling effects originating from system imperfections and limitations and describe algorithmic mitigation techniques to overcome some of them. Their impact on system performance is analyzed in the context of the Pathfinder mission.

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