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VOLUME 61 (1995) | ISSUE 10 | PAGE 781
Optical quenching of coherence of states induced in optical transitions; saturation of the four-wave-mixing signal
It is suggested that saturation of four-wave mixing and other phenomena involving coherent states of optical centers be regarded as a consequence of a universal optical quenching of coherence of states. In other words, coherent states of centers are put out of phase by photons of the same optical field which creates the coherence. It is shown in the particular case of an ethanol solution of rhodamine В that saturation of four-wave mixing can be described quantitatively over a broad range of the pump power density Ip in terms of this hypothesized optical quenching of the coherence of states. This hypothesis also makes it possible to determine the optical cross section for this quenching, asThe value ae=5JX 10"12 cm2 is found for an ethanol solution of rhodamine B. This figure is four orders of magnitude higher than the absorption cross section σα=2.2Χ 10"16 cm2. © 7995 American Institute of Physics.