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Thus at the optical wavetion since s q 1 for free

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Unformatted text preview: is smaller than the atom, shown in units of the recoil momentum hq, is ant ¯ speed of sound in the condensate (position indicated by circle). symmetric about v 0 as condensate atoms are Brag Images are 3.3 3 3.3 mm. scattered in either the forward or the backward directio depending on the sign of v [14]. Both beams were derived from a common source, and From these spectra, we determined the total line streng then passed through two acousto-optical modulators opand the center frequency (Fig. 3) by fitting the momentu erated with the desired frequency difference v , giving the transfer to the difference of two Gaussian line shapes, re beams a detuning of 1.6 GHz below the jF 1 ! jF 0 resenting excitation in the forward and the backward dire 0, 1, 2 optical transitions. Thus, at the optical wavetion. Since S q 1 for free particles, we obtain the stat length of 589 nm, the Bragg recoil velocity was hq m ¯ structure factor as the ratio of the line strengths for th 7 mm s, giving a predicted Bragg resonance frequency of trapped and the expanded atomic sa...
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