Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.54: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Design of a Transportable Cavity Using Mirrors with Single-Crystalline Coatings. — •Sofia Herbers, Sebastian Häfner, Uwe Sterr, and Christian Lisdat — Physikalisch-Technische-Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig
Ultra-stable high-finesse cavities are key components of laser systems used in optical clocks, which are applicable in relativistic geodesy or space-time research. However, many applications require a transportable system that cannot rely on a well-controlled laboratory environment. Present transportable cavities exhibit mainly two limiting factors: One is Brownian noise especially in the mirror substrates and coatings, the other is vibration sensitivity due to the mounting. The transportability of the cavity confines the length since longer spacers cause higher vibration sensitivity. Hence, the influence of the thermal noise due to the mirrors cannot be reduced by very long resonators.
Here, we present a design of a reference cavity for a transportable strontium lattice clock using single-crystalline coated mirrors to reduce Brownian noise and a special mounting system to minimize the vibration sensitivity of the cavity. Finite element simulations predict a frequency noise floor of 1 × 10−16. Furthermore, measurements using a provisionally spacer with the single-crystalline coated mirrors result in a finesse of about 130000.
This work is supported by QUEST, DFG (RTG 1729, CRC 1128), and the European Metrology Research Programme (EMRP) in ITOC, and QESOCAS. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.