We present an experimental and theoretical study of self-diffraction in saturable absorbers, concentrating on the case of high-intensity beams interfering within the medium. We have observed fourth-order coherent scattering in DODCI. In our theory, which is not perturbative and is in quantitative agreement with the experiment, high-order scattering arises from the nonsinusoidal spatial modulation of the population grating.
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Fragnito et al. (1986) studied this question.
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