Abstract
When a resonant Raman laser field interacts with a three-level energy system, the system can undergo changes of linear and nonlinear optical properties. Especially in an optically thick medium, a strong resonant electromagnetic field can dress the energy states so that another resonant probe field may not be absorbed. This is due to destructive quantum interference between two absorption paths from the ground state to the dressed states. This phenomenon, which is called electromagnetically induced transparency1 (EIT), was proposed by S. Harris and observed in several atomic vapors and solids.2 Recently, the potential applications of EIT to nonlinear optical processes have been demonstrated in the areas of four-wave mixing,3 lasers without inversion,4 and optical memory.5 The observation of EIT in solid media triggers the study of EIT applications of nonlinear optical processes such as dynamic random access optical memory and turbulence diagnostics.
© 1999 Optical Society of America
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