Coherence of a squeezed sodium atom laser generated from Raman output coupling

Chunjia Huang, Huiyong He, Lijun Tang

M. Klug, Sergey I. Kablukov, B. Wellegehausen

贺慧勇 Huiyong He, 黄春佳 Chunjia Huang

The coherence of a squeezed sodium atom laser generated from a Raman output coupler, in which the sodium atoms in Bose-Einstein condensate (BEC) interact with two light beams consisting of a weaker squeezed coherent probe light and a stronger classical coupling light, is investigated.The results show that in the case of a large mean number of BEC atoms and a weaker probe light field, the atom laser is antibunching, and this atom laser is second-order coherent if the number of BEC atoms in traps is large enough.

E. W. Hagley, L. Deng, Mikio Kozuma +4 more

Extraction of sodium atoms from a trapped Bose-Einstein condensate (BEC) by a coherent, stimulated Raman process is demonstrated. Optical Raman pulses drive transitions between trapped and untrapped magnetic sublevels, giving the output-coupled BEC fraction a well-defined momentum. The pulsed output coupling can be run at such a rate that the extracted atomic wave packets strongly overlap, forming a highly directional, quasi-continuous matter wave.

贺慧勇 He Huiyong, 黄春佳 Huang Chunjia

Huang Chun-Jia

The squeezing properties of light field in the process preparing Raman-type atom laser via stimulated Raman transition of the Sodium atom Bose-Einstein condensate(BEC) interacting with two light beams,a weaker squeezed coherent probe light and a stronger classical pump light,are studied.The results show that the squeezed coherent probe light can be periodically squeezed.The squeezing period of the probe light is related to the mean number of atoms in trap,the strength of interaction between squeezed light and BEC atoms,and the detuning of the light,and the squeezing depth is determined by the initial squeezing factor of the probe light.