Nonlinear optical processes using electromagnetically induced transparency
Stephen E. Harris, J. E. Field, Ataç İmamoğlu · Physical Review Letters · 1990
We show that by applying a strong-coupling field between a metastable state and the upper state of an allowed transition to ground one may obtain a resonantly enhanced third-order susceptibility while at the same time inducing transparency of the media. An improvement in conversion efficiency and parametric gain, as compared to weak-coupling field behavior, of many orders of magnitude is predicted.