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  Noise sources in the LTP heterodyne interferometer

Wand, V., Bogenstahl, J., Braxmaier, C., Danzmann, K., Garcia, A., Guzman, F., et al. (2006). Noise sources in the LTP heterodyne interferometer. Classical and Quantum Gravity, 23(8), S159-S167.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4C03-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4C06-0
Genre: Conference Paper

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cqg6_8_s21.pdf (Publisher version), 498KB
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 Creators:
Wand, V.1, Author              
Bogenstahl, Johanna1, Author              
Braxmaier, Claus, Author
Danzmann, Karsten1, Author              
Garcia, Antonio1, Author              
Guzman, F.1, Author              
Heinzel, Gerhard1, Author              
Hough, J., Author
Jennrich, Oliver, Author
Killow, Christian J., Author
Robertson, D., Author
Sodnik, Z., Author
Steier, Frank1, Author              
Ward, H., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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 Abstract: The LISA Technology Package uses a heterodyne Mach–Zehnder interferometer to monitor the relative motion of the test masses with picometer accuracy. This paper discusses two classes of noise sources that were identified and investigated during the prototype experiments. Most troublesome are electrically induced sidebands on the light, which give rise to nonlinearities in the interferometer output. Even worse, if the differential pathlength between two optical fibres fluctuates, a noise term of milliradian amplitude appears and completely spoils the performance. We discuss the origin and mitigation of this process. Dissimilar beam shapes of the interfering beams produce another type of noise in conjunction with beam jitter and spatially inhomogeneous photodetectors. To study and minimize this effect, we have built a real-time high-resolution phasefront imaging system that will be used for the production of the flight model.

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 Dates: 2006
 Publication Status: Published in print
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 Identifiers: eDoc: 265183
DOI: 10.1088/0264-9381/23/8/S21
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Title: 6th Edoardo Amaldi Conference On Gravitational Waves
Place of Event: Okinawa, Japan
Start-/End Date: 2005-06-20 - 2005-06-24

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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 23 (8) Sequence Number: - Start / End Page: S159 - S167 Identifier: ISSN: 0264-9381