Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.101: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Tunable high finesse cavities incorporating a piezoelectric actuator — •Katharina Möhle, Klaus Döringshoff, Moritz Nagel, Evgeny V. Kovalchuk, and Achim Peters — Humboldt-Universität zu Berlin, Institut für Physik, AG Optische Metrologie, Newtonstr. 15, 12489 Berlin
The spaceborne gravitational wave detector LISA (Laser Interferometer Space Antenna) aims to measure gravitational waves with a strain < 10−21, which demands an extraordinary frequency stability of the same order of magnitude. Therefore, a three-stage frequency stabilization scheme is proposed, which requires a tunable prestabilization in order to accommodate slow Doppler-shifts caused by yearly variation of the triangular satellite configuration.
For this purpose we investigated the performance of a tunable high finesse optical cavity incorporating a piezoelectric actuator. Our beat measurements reveal a laser frequency noise below 20 Hz/√Hz at Fourier frequencies higher than 10 mHz while the cavity can be continuously tuned over more than one free spectral range with a bandwidth of 5 kHz. Thus, our setup fulfills the requirements for a tunable prestabilization for LISA.
Furthermore, we will compare different piezo materials and discuss diverse piezo tunable cavity designs, which account for the requirements given by a space mission.
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 DLR 50 OQ 0601.