Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Laseranwendungen: Optische Messtechnik
Q 31.2: Talk
Wednesday, March 4, 2009, 14:15–14:30, Audi-A
A High Resolution Interferometer for LISA and its Application to Technology Verification — •Martin Gohlke1,2, Thilo Schuldt2,3, Dennis Weise1, Ulrich Johann1, Achim Peters2, and Claus Braxmaier3 — 1EADS Astrium GmbH — 2Humboldt-Universität zu Berlin — 3HTWG Konstanz
In the current concepts for the LISA payload architecture an Optical Readout (ORO) is necessary to detect relative motion between the inertial reference (i.e. the proof mass) and the optical bench aboard on each spacecraft. In collaboration with the Humboldt University Berlin and the HTWG Konstanz, a prototype ORO has been realized over the past years, which meanwhile is close to achieving the required picometer-sensitivity in translation and nanorad-sensitivity in attitude metrology. The polarizing heterodyne interferometer is characterized by a highly symmetric setup and employs differential wavefront sensing for determination of the proof mass tilt in 2 degrees of freedom. We will discuss the experimental setup and its latest performance, as well as its application to first verification of critical LISA subsystems. For example, the tilt mechanism of the so-called In-Field Pointing and the mirror surface flatness in the pm-range. Our current activities further include novel developments for other critical parts of the optical metrology chain, namely the laser source and the phasemeter, where the respective approach and first results will be presented.