BEC @ JILA

June ‘95

BEC in external PotetnialV. Bagnato et al. Phys.Rev. 35, p4354 (1987)

BEC in external PotetnialV. Bagnato et al. Phys.Rev. 35, p4354 (1987)

free space

potential

Phase transitionPhase transition

BEC @ MIT, Sept. ‘95

The shadow cast by a condensateThe shadow cast by a condensatePhase transitionPhase transition

BEC in Trapsbasics

Rev.Mod.Phys. 71, p463 (1999)

BEC in Trapsbasics

Rev.Mod.Phys. 71, p463 (1999)

BEC in Trapsinteractions

Rev.Mod.Phys. 71, p463 (1999)

BEC in Trapsinteractions

Rev.Mod.Phys. 71, p463 (1999)

1 ms 5 ms 10 ms

20 ms 30 ms 45 ms

Signatures of BEC: Anisotropic expansion

Signatures of BEC: Anisotropic expansion

TOF expasion movieTOF expasion movie

Absorption 0% 100%

16 ms 23 ms 28 ms 41 ms 48 ms

Collective excitation in TOF(observed in ballistic expansion)

Collective excitation in TOF(observed in ballistic expansion)

Direct non-destructive observationof collective excitations

10 msec. per frame

200m

Sloshing motionSloshing motion

Shape oscillations

“Non-destructive” observation of a time-dependent wave function

350m

5 milliseconds per frame

Shape oscillationShape oscillation

m=0 quadrupole-type oscillationat 29 HzMovie, quadrupole oscillationMovie, quadrupole oscillation

Low T

High T

“Matter wave amplification”Formation of the condensate bosonic stimulation

Formation of the condensate bosonic stimulation

Miesner, Stamper-Kurn, Andrews, Durfee, Inouye, Ketterle, Science 279, 1005 (1998)

Two condensates ...

50 m

Interference of condensatesAndrews, et al, Science 275, 589 (1997)

Interference of condensatesAndrews, et al, Science 275, 589 (1997)

Cutting expanding

Matter WAVES

Rf output couplingat 200 Hz

A pulsedAtom Laser

Gravity

1 mm

Atom laser movie

Atomic tunnel arraysAtomic 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 = mgz/

Atom LaserAtom Laser

Measurement of the spatial coherence of

a trappedBose gas at the phase transition

I. Bloch, T. W. Haensch & T. Esslinger, Nature 403, p166 (2000)

Measurement of the spatial coherence of

a trappedBose gas at the phase transition

I. Bloch, T. W. Haensch & T. Esslinger, Nature 403, p166 (2000)

Non linear Matter Wave Optics

Non linear Matter Wave Optics

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

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

Stimulated emission/scatteringStimulated emission/scattering

Verstärkung von

MateriewellenPhys. Blätt. 57, Nr.5, p55 (2001)

Verstärkung von

MateriewellenPhys. Blätt. 57, Nr.5, p55 (2001)

Degenerate Fermi Gas

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

Degenerate Fermi Gas

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