Abstract

A tunable resonant enhancement of third-harmonic and sum-frequency generation is observed at four-photon resonance with the 71S, 61D, and 63D levels and at five-photon resonance with 91P levels of atomic mercury. The causes of this resonant enhancement are examined and appear to include a nonlinear refractive index and nonlinear mixing of order 5 and higher. A perturbative treatment of the nonlinearities is found to be inadequate.

© 1985 Optical Society of America

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