Abstract

The demonstration of electromagnetically induced transparency (EIT) on an atomic transition along with its potential possibilities of applications has driven a much deeper investigation on the atom-field interaction, specifically concerning to the level degeneracy.¹ This coherent response of an atomic system can also be studied through four-wave mixing (FWM), a process named electromgnetically induced grating (EIG),^2,3 which present the advantage of being a background free technique. In this work we present results on the observation of subnatural EIG resonance in a degenerate open two-level system where the Zeeman degeneracy plays a important role.

© 2001 Optical Society of America