JILA June ‘95. BEC in external Potetnial V. Bagnato et al. Phys.Rev. 35, p4354 (1987) free space potential.

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Presentation transcript:

JILA June ‘95

BEC in external Potetnial V. Bagnato et al. Phys.Rev. 35, p4354 (1987) free space potential

Phase transition

MIT, Sept. ‘95 The shadow cast by a condensate Phase transition

BEC in Traps basics Rev.Mod.Phys. 71, p463 (1999)

BEC in Traps interactions Rev.Mod.Phys. 71, p463 (1999)

Signatures of BEC: Anisotropic expansion

TOF expasion movie

Collective excitation in TOF (observed in ballistic expansion)

Direct non-destructive observation of collective excitations 10 msec. per frame Sloshing motion

Shape oscillations “Non-destructive” observation of a time-dependent wave function 5 milliseconds per frame Shape oscillation

m=0 quadrupole-type oscillation at 29 Hz Movie, quadrupole oscillation Low T High T

Sound = propagating density perturbations 1.3 msec. per frame Sound propagation

“Matter wave amplification” Formation of the condensate bosonic stimulation Miesner, Stamper-Kurn, Andrews, Durfee, Inouye, Ketterle, Science 279, 1005 (1998)

Two condensates... Interference of condensates Andrews, et al, Science 275, 589 (1997) Cutting expanding

Matter WAVES

Rf output coupling at 200 Hz A pulsed Atom Laser Gravity 1 mm Atom laser movie

Atomic tunnel arrays Confining potential: Bose condensed atoms are loaded into a vertical lattice potential and subsequently tunnel to the continuum. Waves interfere to form pulses in region A. Array Output: Measured pulse period of ~1.1 msec is in excellent agreement with calculated  J = mg  z/ 

Atom Laser

Measurement of the spatial coherence of a trapped Bose gas at the phase transition I. Bloch, T. W. Haensch & T. Esslinger, Nature 403, p166 (2000)

Non linear Matter Wave Optics

4-wave mixing with matter waves L. Deng, et.al. Nature 398, p218 (1999)

Stimulated emission/scattering

Verstärkung von Materiewellen Phys. Blätt. 57, Nr.5, p55 (2001)

Degenerate Fermi Gas Andrew G. Truscottet al. Science 291, p2570 (2001)