Abstract
It is possible to see that two or three incident fields interacting in a quadratic nonlinear medium χ(2) yield intrinsically stable phenomena in configurations with no feedback1,2; the introduction of feedback, for example, with a ring cavity, gives rise to a nontrivial behavior. This is due to the quadratic nonlinearity behaving as a cubic one. As has been shown by Ref. 3, a single χ(2) medium, with two or three fields present in it, can produce a continuous exchange of energy between the fields with a nonlinear phase shift; these phenomena are typically present in a χ(3) medium.
© 1993 Optical Society of America
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