Experimental Investigation of the Electromagnetically Induced-Absorption-Like Effect for an N-Type Energy Level in a Rubidium BEC**Supported by the National Key Research and Development Program of China under Grant No 2016YFA0301602, the National Natural Science Foundation of China under Grant Nos 11474188 and 11704234, the Fund for Shanxi ‘1331 Project’ Key Subjects Construction, and the Program of Youth Sanjin Scholar.

Abstract

We study the electromagnetically induced-absorption-like (EIA-like) effect for an n-type system in an 87Rb Bose–Einstein condensate (BEC) using the absorption imaging technique for coupling and driving lasers operating at the D1 and D2 lines of 87Rb. The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field. The absorption imaging technique accurately reveals the EIA-like effect of the n-type system. This coherent effect in an n-type system is useful for optical storage, tunable optical switching, and so on.