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

Theory of four-photon resonant vacuum-ultraviolet generation with reabsorption via resonant two-photon process

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