摘要: Electromagnetically induced transparency is a technique for eliminating the effect of medium on propagating beam electromagnetic radiation. EIT may also be used, but under more limited conditions, to eliminate optical self‐focusing and defocusing improve transmission laser beams through inhomogeneous refracting gases metal vapors, as figure 1 illustrates. The used create large populations coherently driven uniformly phased atoms, thereby making possible new types optoelectronic devices.