Abstract
Abstract The resonant third-order nonlinear optical properties of hemicyanine, 3-methyl-2-(6-morpholino-1,3,5-hexatrienyl)-benzoxazolium iodide (HC) doped polymethylmethacrylate (PMMA) thin films were measured by degenerate four- wave mixing (DFWM) at 580nm with 4ps pulses. It was found that the temporal profile of DFWM signal in 0.01M HC doped PMMA film was much different from that in dilute dimethylsulfoxide solution of HC. The decay of DFWM signal in the thin film consisted of the faster component (∼10ps) in addition to the slower one (>100ps). The phase conjugate reflectivity was not proportional to the square of pump intensity and saturated even in the weak pump intensity. The effective X (3) xxxx value of the thin film was relatively large (2.8∼10−9esu) at weak pump intensity (0.03μJ/pulse).
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