15.20.Mc Magnetic atom chips

Electron beam driven alkali metal atom source for loading a magneto-optical in a cryogenic enviroment

Date: 
2011-03-26
Reference: 

S. Haslinger, R. Amusuess, Ch. Koller, C. Hufnagel, N. Lippok, J. Majer, J. Verdu, S. Schneider, and J. Schmiedmayer
submitted http://arxiv4.library.cornell.edu/PS_cache/arxiv/pdf/1003/1003.5144v2.pdf, accepted in Applied Phys. B
Applied physics B - Lasers and Optics, 102 (2011), pp. 819 - 823
doi 10.1007/s00340-011-4447-x

We present a versatile and compact electron beam driven source for alkali metal atoms which can operate even with a heat dissipation of less than 1mW, and can therefore be implemented inside a closed cycle cryostat. Atoms are loaded into a Magneto-Optical Trap (MOT) and at a given thermal input power, loading rates three orders of magnitude higher than in a typical MOT loaded by an alkali metal dispenser are achieved.

Imaging of microwave fields using ultracold atoms

Date: 
2010-09-23
Reference: 

P. Böhi, M. F. Riedel, T. W. Hänsch, and P. Treutlein
Applied Physics Letters 97, 051101 (2010)
http://arxiv.org/abs/1009.4651

We report a technique that uses clouds of ultracold atoms as sensitive, tunable, and non-invasive probes for microwave field imaging with micrometer spatial resolution. The microwave magnetic field components drive Rabi oscillations on atomic hyperfine transitions whose frequency can be tuned with a static magnetic field. Readout is accomplished using state-selective absorption imaging. Quantitative data extraction is simple and it is possible to reconstruct the distribution of microwave magnetic field amplitudes and phases.

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