Abstract
Methylred-doped polymethyl methacrylate (PMMA) can generate a phase-conjugate wave due to degenerate four-wave mixing (DFWM) and holographic processes while methylred-doped gelatin can generate only through the DFWM process. The phase-conjugate wave due to the holographic process differs from that due to the DFWM process in the respect that light induces longlived photochemical changes of host matrix and/or guest dye in refractive index and/or absorption coefficient.
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