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Q: Fachverband Quantenoptik und Photonik
Q 28: Präzisionsmessungen und Metrologie 4
Q 28.6: Vortrag
Dienstag, 13. März 2012, 15:15–15:30, V47.02
A gas-tight prestressed piezo cavity as a tunable optical frequency reference for LISA and for future cavity enhanced spectroscopy applications — •Katharina Möhle, Klaus Döringshoff, Moritz Nagel, Evgeny V. Kovalchuk, and Achim Peters — Humboldt Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin
We set up different types of piezo tunable high finesse cavities in the context of the gravitational wave detector LISA, where a tunable frequency prestabilization is desired. The implementation has so far been done by gluing the piezo directly between mirror and spacer of the cavity. These tunable cavities fulfill all LISA requirements for a tunable prestabilization and show a relative stability of 10−14.
Since the piezo actuator can not withstand excessive tensile and shear forces, prestressing of the piezo is of interest to handle, e.g., vibrations during the launch of a space mission. Therefore we designed a new tunable cavity where the piezo is prestressed with 0.5 to 1 MPa by being clamped between the Zerodur parts of the cavity spacer.
At the same time the cavity can be made gas-tight and is bonded in a way such that the piezo has no contact to the intracavity volume. Thus the newly designed piezo tunable cavity is a useful tool for cavity enhanced spectroscopy of week narrow reference lines aiming for the implementation of new types of molecular standards.
This work is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number 50 OQ 0601