Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 21: Precision spectroscopy of atoms and ions III (with Q)
A 21.6: Vortrag
Dienstag, 18. März 2014, 15:15–15:30, BEBEL SR140/142
Imaging of Relaxation Times and Microwave Field Strength in a Microfabricated Vapor Cell — •Andrew Horsley1, Guan-Xiang Du1, Matthieu Pellaton2, Christoph Affolderbach2, Gaetano Mileti2, and Philipp Treutlein1 — 1Departement Physik, Universität Basel, Switzerland — 2Laboratoire Temps-Fréquence, Institut de Physique, Université de Neuchâtel, Switzerland
We present a new characterisation technique for atomic vapor cells [1], combining time-domain measurements with absorption imaging to obtain spatially resolved information on decay times, atomic diffusion and coherent dynamics. The technique is used to characterise a 5 mm diameter, 2 mm thick microfabricated Rb vapor cell, with N2 buffer gas, placed inside a microwave cavity. Time-domain Franzen and Ramsey measurements are used to produce high-resolution images of the population (T1) and coherence (T2) lifetimes in the cell, while Rabi measurements yield images of the σ−, π and σ+ components of the applied microwave magnetic field. We observe a ‘skin’ of reduced T1 and T2 times around the edge of the cell due to the depolarisation of Rb after collisions with the silicon cell walls. Our observations suggest that these collisions are far from being 100% depolarising. Our technique is useful for vapor cell characterisation in atomic clocks, atomic sensors, and quantum information experiments.
[1] A. Horsley et al., Imaging of Relaxation Times and Microwave Field Strength in a Microfabricated Vapor Cell, accepted to PRA. Arxiv: 1306.1387