Tuesday, May 20, 2008
Note Special Day
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Sasikumar Palaniyappan
[Host: Bob Jones]
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11:00 AM, Room 204
Note Special Time
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University of Delaware |
| Physics Building |
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“Relativistic rescattering and multielectron ionization of atoms and molecules in strong and ultrastrong laser fields” |
ABSTRACT:
| We present manipulations of a cloud of cold Sr 88 atoms in a vertical optical lattice potential. In particular we observe a resonant broadening of the atomic cloud by modulating the phase or the amplitude of the lattice potential. This broadening is caused by a resonant tunneling of an atomic wave functions between lattice cites. The width of the resonance spectra is determined only by the Fourier limit due to the absence of decoherence. This is experimentally confirmed up to 15 s of the modulation time. The small linewidth allows us to measure the local gravity with a sensitivity of 10 -6 g.
We demonstrate stretching of an atomic wave function over a distance of 1 mm.
Then atomic wave function can be refocused in controlled way, to a size close to initial.
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