Matched Slow Pulses Using Double Electromagnetically Induced Transparency

摘要

We implement double electromagnetically-induced transparency (double EIT) inrubidium vapor, using a tripod-shaped energy level scheme consisting ofhyperfine and magnetic sublevels of the 5S1/2 to 5P1/2 transition. We showexperimentally that through the use of double EIT one can control the contrastof transparency windows as well as group velocities of the two signal fields.In particular, the group velocities can be equalized, which holds promise togreatly enhance nonlinear optical interaction between these fields.