Hannover 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 53: SYCM: Contributed posters for the Symposium Hot topics in cold molecules: From laser cooling to quantum resonances
Q 53.5: Poster
Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof
Designing a microwave trap for ultracold polar molecules — •Maximilian Löw, Martin Ibrügger, Martin Zeppenfeld, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
Ultracold polar molecules are promising candidates for many different applications because of their rich internal structure and long-range dipole-dipole interactions. Optoelectrical Sisyphus cooling provides a high number of molecules at sub-millikelvin temperatures as we demonstrated with formaldehyde (H2CO) in the past [1]. However, the electric trap used in the experiment prevents us from reaching high phase-space densities due to its large volume.
For this reason, we are designing a microwave trap as the next stage in our experiment. Working at a frequency of 50 GHz it acts as a red-detuned dipole trap on the rotational transition |J,Ka,Kc>= |211>←|110> of formaldehyde. We present our progress in developing a high-finesse open mm-wave resonator to achieve trap depths of several mK with reasonable input power while maintaining optical access. We also show that we can prepare cooled formaldehyde in its ortho rotational ground-state |110>. The microwave trap will enable us to further reduce the molecule temperature using evaporative or sympathetic cooling and allows us to aim for the regime of quantum degeneracy.
[1] A. Prehn et al., Phys. Rev. Lett. 116, 063005 (2016).