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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 29 — Oct. 10, 2010
  • pp: 5665–5677

Coupling characterization and noise studies of the optical metrology system onboard the LISA Pathfinder mission

Gerald Hechenblaikner, Rüdiger Gerndt, Ulrich Johann, Peter Luetzow-Wentzky, Vinzenz Wand, Heather Audley, Karsten Danzmann, Antonio Garcia-Marin, Gerhard Heinzel, Miquel Nofrarias, and Frank Steier  »View Author Affiliations


Applied Optics, Vol. 49, Issue 29, pp. 5665-5677 (2010)
http://dx.doi.org/10.1364/AO.49.005665


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Abstract

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 spaceborne gravitational wave detector. At its core, the OMS consists of four heterodyne Mach–Zehnder interferometers, a highly stable laser with an 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 (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 within the context of the Pathfinder mission.

© 2010 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(040.2840) Detectors : Heterodyne
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: June 11, 2010
Manuscript Accepted: August 20, 2010
Published: October 7, 2010

Citation
Gerald Hechenblaikner, Rüdiger Gerndt, Ulrich Johann, Peter Luetzow-Wentzky, Vinzenz Wand, Heather Audley, Karsten Danzmann, Antonio Garcia-Marin, Gerhard Heinzel, Miquel Nofrarias, and Frank Steier, "Coupling characterization and noise studies of the optical metrology system onboard the LISA Pathfinder mission," Appl. Opt. 49, 5665-5677 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-29-5665

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