Experimental Investigation of the Electromagnetically Induced-Absorption-Like Effect for an N-Type Energy Level in a Rubidium BEC

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 D_1 and D_2 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.