Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.43: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
48 cm long ultra-stable glass resonator with crystalline mirror coatings — •Steffen Sauer1, Steffen Rühmann1, Dominika Fim1, Klaus Zipfel1, Nandan Jha1, Waldemar Friesen-Piepenbrink1, Rasmus Holst1, Sebastian Häfner2, Thomas Legero2, Wolfgang Ertmer1, Uwe Sterr2, and Ernst Rasel1 — 1Institut für Quantenoptik, Hannover, Deutschland — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland
Ultra-stable lasers are one of the key components utilized in optical frequency standards for probing ultra-narrow transitions. Currently, the ultimate frequency stability of resonators is limited by the thermal noise of the mirror coating. To reduce the resulting frequency instability we are setting up a resonator of 48 cm length with crystalline mirror coatings Cole et al., Nat. Phot. 7, 644 (2013). This leads to a low Brownian noise floor with a calculated fractional frequency instability of 3× 10−17 which is competitive to cryogenic optical resonators. The system is built in cooperation with the PTB following the design in Häfner et al., Opt. Lett. 40, 2112 (2015). The resonator will be characterized against the single-crystal silicon resonators at PTB and will be used as ultra-stable local oscillator for the magnesium lattice clock experiment at IQ, Hannover. A frequency comb will transfer the frequency stability of the long resonator at 1560 nm to our current clock laser system at 916 nm, which is limited at 4× 10−16 in 1 s. The lower frequency noise will lead to longer interrogation time, which will reduce the noise contribution of the Dick effect. We report on the progress and performance of our ultra-stable laser system.