Post on 15-Jan-2016
description
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)