Amplified reflection, phase conjugation, and oscillation in degenerate four-wave mixing by Amnon Yariv and David M. Pepper (1977)

Optics Letters 1(1), 16–18. Primary theoretical analysis.

Institutional author archive: authors.library.caltech.edu/records/r492q-t5h18

The abstract identifies amplified phase-conjugated propagation and parametric oscillation. The present coupled-equation solution is derived independently with the sign convention of the exam's differential equations.