An optical physicist who, with Amnon Yariv, analyzed phase conjugation and amplified reflection through degenerate four-wave mixing. The conjugated field reverses the spatial phase variation of an incident wave, connecting a nonlinear interaction to backward propagation that can retrace optical distortions. Their 1977 paper also treats parametric oscillation in the same setting.[ref]
Amplified reflection, phase conjugation, and oscillation in degenerate four-wave mixing by Amnon Yariv and David M. Pepper. Abstract: phase-conjugated propagation and parametric oscillation
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