Photoreactive phase conjugation strength in disperse red 1 doped poly(methylmethacrylate) thin films

Near-resonant optical pumping was used to modulate third-order susceptibility chi((3)) in disperse red 1 doped poly(methylmethacrylate) thin films. An optically pumped degenerate four-wave mixing (DFWM) experiment was conducted to examine the photoreactive phase conjugation (PC) signals. Experimental results indicated a large anisotropy in PC signals arising from \chi(3333)((3))\(2), and almost isotropic PC signals from \chi(1331)((3))\(2) under s-polarized and p-polarized pump fields. Additionally, a dynamic microscopic model, based on the theory developed by Sekkat [Synth. Met. 54, 373 (1993); J. Phys. Chem. B 106, 12407 (2002); Opt. Commun. 229, 291 (2004)] was presented to describe the observed optical nonlinear responses. Results from the model were generally consistent with those of the optically pumped DFWM experiment. (C) 2005 American Institute of Physics.