Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 21: Poster I
Q 21.38: Poster
Dienstag, 9. März 2010, 16:00–19:00, Lichthof
High performance iodine frequency reference for tests of the LISA laser system — •Klaus Döringshoff, Katharina Möhle, Moritz Nagel, Evgeny V. Kovalchuk, and Achim Peters — Humboldt Universität zu Berlin, Institut für Physik, AG Optische Metrologie, Hausvogteiplatz 5-7, 10117 Berlin
In our group different concepts for tunable optical frequency references for the spaceborne gravitational wave detector LISA are developed and tested. Here we present our fixed and absolut frequency reference for the validation of tunability and stability of these new frequency references.
For absolut frequency stabilization the frequency doubled output of a 1064 nm Nd:YAG laser is stabilized to the a10 component of the R(56)32-0 transition of 127I2. Using a threefold-pass scheme through a 80 cm iodine cell and the modulation transfer spectroscopy technique a frequency stability of ∼ 1×10−14 at 1s integration time and frequency noise ∼ 4 Hz/√Hz at Fourier frequencies of 1-100 Hz is achieved. We give a detailed analysis of significant parameters and systematic effects and present our efforts aiming at a frequency stability in the 10−16 range at averaging times of 1000 s. An outlook will be given for a frequency stabilization at 508 nm, where transitions with linwidths below 10 kHz have been observed. These are promising for high performance frequency references superior to those at 532 nm.
In addition the frequency stability of a high performance ULE cavity with a turning point of it’s thermal expansion curve above room temperature will be presented.