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Proceedings Paper

MAMMUT: mirror vibration metrology for VLTI
Author(s): Izabela Spaleniak; Frank Giessler; Reinhard Geiss; Stefano Minardi; Thomas Pertsch; Ralph Neuhaeuser; Martin Becker; Manfred Rothhardt; Françoise Delplancke; Andrea Richichi; Serge Ménardi; Christian Schmid
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Paper Abstract

MAMMUT (Mirror vibrAtion Metrolology systeM for the Unit Telescope) is an ESO funded feasibility project for the development of a fiber interferometer prototype designed for optical path laser-metrology along the optical train of the Unit Telescopes (UT) of the Very Large Telescope Interferometer (VLTI). Fast mechanical vibrations originating in the VLTI cause fast variations of the optical path difference between two arms of the stellar interferometer, thus reducing the contrast of measured interference fringes. MAMMUT aims at monitoring in real time the optical path variations inside the Coudé train of the UT, for active control purposes. MAMMUT features a 250-meter-long optical fiber which can be used to deliver and inject a laser beam at 1353 nm into the UT. The injected beam can be dropped from the telescope in the Coudé room and interfered with a phase reference, provided by the second 250-meter-long arm of the fiber interferometer. The optical path variations are measured by means of an active homodyne scheme. Coherence between the beam at the injection point and the phase reference is provided by active fiber stabilization, made possible by the implementation of an internal metrology channel in MAMMUT. Here we present the initial laboratory performance results of the MAMMUT prototype, which will be able to sense optical path variations of +/- 5 μm with sub-10 nm precision within a bandwidth of at least 100 Hz.

Paper Details

Date Published: 21 July 2010
PDF: 7 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77343Y (21 July 2010); doi: 10.1117/12.856898
Show Author Affiliations
Izabela Spaleniak, Friedrich-Schiller-Univ. Jena (Germany)
Frank Giessler, Friedrich-Schiller-Univ. Jena (Germany)
Reinhard Geiss, Friedrich-Schiller-Univ. Jena (Germany)
Stefano Minardi, Friedrich-Schiller-Univ. Jena (Germany)
Thomas Pertsch, Friedrich-Schiller-Univ. Jena (Germany)
Ralph Neuhaeuser, Friedrich-Schiller-Univ. Jena (Germany)
Martin Becker, IPHT Jena (Germany)
Manfred Rothhardt, IPHT Jena (Germany)
Françoise Delplancke, European Southern Observatory (Germany)
Andrea Richichi, European Southern Observatory (Germany)
Serge Ménardi, European Southern Observatory (Germany)
Christian Schmid, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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