Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 29: Poster I
Q 29.6: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer
FEM optimisation of a high-finesse reference cavity — Didier Guyomarc’h, Gaetan Hagel, Cédric Zumsteg, Caroline Champenois, Marie Houssin, and •Martina Knoop — CNRS/Université de Provence, Centre de St Jerome, Case C21, 13397 Marseille Cedex 20, France
The interrogation of the clock transition of a single trapped Ca+ ion requires a laser at 729 nm stabilized to a couple of Hz per second with a linewidth of the same order of magnitude. These performances are achieved by locking the laser on an extremely well isolated reference cavity of very high finesse. Vertical mounting of the reference cavity can reduce its sensitivity to vibrations as described in [1]. We have designed a comparable vertical cavity with an overall length of 150 mm resulting in a FSR of 1GHz. Optimisation of the cavity design has been carried out with a Finite-Elements Method, leading to expected relative length variations below 10−14. The influence of the variation of the mesh size has been studied, and the machining has been carried out in a two-step process to optimize the geometry of the presented cavity.
[1]M. Notcutt, L. Ma, J. Ye, and J. Hall, Opt. Lett 30, 1815 (2005).