Bose 2.2 User Manual download pdf (Page 65)

and depends only on the time

pulse

and the lattice depth

lat

via the lattice param-

eter

lat

). The normalization of the relative populations

is given by

max

−n

max

(Q, t

pulse

) = 1, where n

max

is the highest populated diﬀraction order.

pulse

0.2 µs

0.7 µs

1.2 µs

1.7 µs

2.2 µs

9.2 µs

7.2 µs

Fig. 4.3, Diﬀraction of a BEC from a light grating:

Each line in the picture

corresponds to a single absorption image, taken after a 6

TOF. The pulse

time

pulse

is increased from 0

to 9

in steps of 0

. The ﬁeld of view

of a single absorption image is 67

m ×

in the

- and the

-direction,

respectively.

In Fig. 4.3, we show the recorded absorption images, taken for a variable time

pulse

after a 6

TOF. In the ﬁrst image, at the time

pulse

= 0

, almost all the atoms are

found in the zeroth order momentum component, resembling an unperturbed BEC. When

increasing

pulse

, we observe that higher order momenta are populated, until the maximum

order

max

= 6 becomes visible at

pulse

∼

. The populations

then undergo

oscillations, until at

pulse

∼

the zeroth order exhibits a (non-perfect) revival, the

populations in all the higher diﬀraction orders becoming small. In the ﬁnal pictures (after

pulse

∼

), we observe a slight asymmetry in the populations

±n

, which is not in

agreement with theory. This indicates a small misalignment of the lattice laser beams.

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