Phase conjugation during second-harmonic generation in few mode fibers
Zel'dovich B. Ya. , Kapitskii Yu. E.
Quadratic-polarizability holograms in optical fibers have been studied experimentally during their writing by picosecond pulses from a neodymium laser and its second harmonic. Phase conjugation of a green signal was achieved during readout of the hologram by oppositely propagating IR light.