Abstract
Several types of nonlinear-optical "extra resonances'' have been discovered in the past decade. These resonances do not occur in low-pressure environments with low-power monochromatic beams. They can be induced, however, by high-power or short pulses, laser fluctuations, collisional dephasing, or other dephasing processes. In all cases, they occur because dephasing or another of these processes rephases quantum-mechanical amplitudes that ordinarily exactly cancel, thereby allowing otherwise unobservable wave-mixing resonances to be seen. This is an especially interesting, phenomenon because the resonances are coherent effects that are induced by an incoherent process (collisional dephasing, laser fluctuations, etc.).
© 1991 Optical Society of America
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