Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster: Quantum Optics and Photonics III
Q 57.33: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik
Ultra-stable UV laser system for an Indium multi-ion clock — •Hartmut Nimrod Hausser1, Tabea Nordmann1, Jan Kiethe1, Alexandre Didier1, Stepan Ignatovich2, and Tanja E. Mehlstäubler1 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Institute of Laser Physics, Novosibirsk, Russia
Multi-ion clocks at optical wavelengths are very promising candidates for atomic clocks with fractional uncertainties below 10−18. Our approach is to perform spectroscopy on Coulomb crystals of 115In+ sympathetically cooled by 172Yb+. 115In+ is directly detectable via the narrow intercombination line 1S0 to 3P1 at 230.6 nm. Spectroscopy can be performed on the electronic 1S0 to 3P0 transition at 236.5 nm.
To address both narrow transitions, we developed two ultra-stable lasers at 922 nm and 946 nm. We achieve a short-term stability of 1.1 × 10−16 at 1 s with the clock laser at 946 nm. To reach an even better stability, the laser is stabilized to another laser frequency locked to a cryogenic Silicon cavity, exhibiting a fractional frequency instability of 4 × 10−17 at 1 s. The lasers are frequency quadrupled to reach the transitions at 230 nm and 236 nm.
To prevent stray light at these deep-UV wavelengths we mode-clean the light with hydrogen loaded and UV-cured large mode-area fibers. We present the assembly process of these fibers and their characterization.