The reduction of inhomogeneous linewidth of Bogoliubov excitations in trapped Bose-Einstein condensate (BEC) was investigated using echo spectroscopy. The echo method used for investigation was based on transfer of Bogoliubov excitations from momentum +q to -q by degenerate two-photon Bragg transition which was induced by an optical lattice. The line shape of echo excitation spectrum was calculated by the Gross-Pitaevskii equation (GPE). The results show an enhancement of echo rate at low momentum which emerged from constructive interference of amplitudes.
|Original language||American English|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Apr 2004|