= David M. Pepper
{c}
{tag=Physicist}
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.<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]{ref}
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