Abstract

In a recent paper¹ we predicted that stochastic fluctuations can produce extra resonances in four-wave mixing experiments. This SFIER4 resonance involves a nonparametric interaction where correlated fluctuations are used to remove a destructive interference between terms in the expression of the third-order susceptibility in analogy to the collision-induced PIER4.² In an earlier publication, Agarwal and Kunasz³ discussed an effect they termed FIER, which occurs when the difference between the two incident frequencies equals a forbidden transition frequency and when two of the three incident waves are identical. The observed signal is not at the PIER4 frequency but rather is an increased signal level at a material resonance.

© 1987 Optical Society of America