ROLE OF ELECTROMAGNETICALLY INDUCED TRANSPARENCY IN RESONANT 4-WAVE-MIXING SCHEMES

The effect of electromagnetically induced transparency in resonant fou r-wave-mixing schemes is investigated in an analysis that goes beyond perturbation theory in the coherent driving field. In addition we exam ine the case where the two-photon pump field is sufficiently strong to necessitate a nonperturbative treatment. This allows us to examine th e cases where either one or both of the driving fields are strong. Pha se matching is included in a plane-wave propagation treatment that mat ches the situation most likely to be encountered in actual experiments . The calculations are in part intended to model real experimental sit uations and thus incorporate driving and pump-field linewidths via the phase-diffusion model and Doppler broadening. With a strong pump-fiel d laser, large enhancements in the efficiency of light generation occu r at frequencies corresponding to the Autler-Townes satellites induced by the strong driving field. In this situation gain and high four-wav e-mixing efficiency are simultaneously present, resulting in the produ ction of a large intensity of coherent radiation.