We have extended our two-photon two-level instability model to include the effects of level Stark shifts and find that the shifts tend to expand the regions of side-mode gain that allow single-wavelength and multiwavelength instabilities to occur. In addition, we find that the instabilities are strongly affected by conjugate scattering off the pump-induced two-photon coherence.
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Ovadia et al. (1985) studied this question.
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