Abstract
We propose and demonstrate a momentum filter for atomic gas-based on a designed Talbot–Lau interferometer. It consists of two identical optical standing-wave pulses separated by a delay equal to odd multiples of the half Talbot time. The one-dimensional momentum width along the long direction of a cigar-shaped condensate is rapidly and greatly purified to a minimum, which corresponds to the ground state energy of the confining trap in our experiment. We find good agreement between theoretical analysis and experimental results. The filter is also effective for non-condensed cold atoms and could be applied widely.
Highlights
Atomic sources with long coherence lengths, corresponding to a narrow momentum width, can be used to observe new physical phenomena and contribute to the improved precision measurement spectroscopy
FIG. 5: TOF signals showing the filtering on two kinds of atomic gases
Curve (1) is the initial atomic gas and curve (2) is the atomic gas after the filter. (a) A cloud of non-condensed cold atoms with temperature 513nK modified by a filter with the interval TT /2. (b) A mixture of condensate and non-condensed cold atoms with temperature 346nK modified by a filter with the interval 5TT /2
Summary
We propose and demonstrate a momentum filter for atomic gas based on a designed TalbotLau interferometer. It consists of two identical optical standing-wave pulses separated by a delay equal to odd multiples of the half Talbot time. The one-dimensional momentum width along the long direction of a cigar-shaped condensate is rapidly and greatly purified to a minimum, which corresponds to the ground state energy of the confining trap in our experiment. The filter is effective for non-condensed cold atoms and could be applied widely. PACS numbers: 67.85.Hj, 67.85.Jk, 03.75.Kk arXiv:1306.3463v1 [physics.atm-clus] 13 Jun 2013
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