Unformatted text preview: laser beams with wave
The chemical potential m of the trapped condensate w
vectors k1 and k2 and frequency difference v , imparting modetermined from the radial width of the condensate di
mentum hq along the axis of the trapped condensate. The
tribution . The noncondensate distribution (typical
Bragg scattering response of trapped condensates [(b) and (d)]
was much weaker than that of condensates after a 5 ms free
less than 20% of the total population) was subtracted fro
expansion [(c) and (e)]. Absorption images [(b) and (c)] afthe images before evaluating the momentum transfer.
ter 70 ms time of ﬂight show scattered atoms distinguished
By varying the frequency difference v , the Bragg sca
from the denser unscattered cloud by their axial displacement.
tering spectrum was obtained for trapped and for freely ex
Curves (d) and (e) show radially averaged (vertically in image)
panding condensates (Fig. 2). The momentum transfer p
proﬁles of the optical density after subtraction of the thermal
distribution. The Bragg scattering velocity...
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- Fall '10
- Physics, Bose-Einstein condensation, Bogoliubov Theory, Bogoliubov quasiparticles