Phase conjugation involving incoherent counterpropagating beams in photorefractive media.
We propose and analyze a new type of phase conjugation between counterpropagating beams in photorefractive materials based on diffraction from transmission gratings only. This effect does not require temporal coherence between the counterpropagating beams and may occur spontaneously, with no external seeding, even with wide (frequency) band light sources.
Segev
M
M
Yariv
A
A