Abstract
This paper presents experimental measurements and theoretical analysis of the third-order optical susceptibility measurements by degenerate four-wave mixing in several classes of polymeric film which have conjugated π-electron structure. A high X(3) value derived from the π- electron conjugation effect is observed, and a subpicosecond response is confirmed. The first group is a conjugated aromatic heterocyclic polymer, poly-p-phenylenebenzobisthiazole (PBT), which has very high mechanical strength due to its rigid rod conformation as weil as environmental stability and a high laser damage threshold. The X(3) measurement in a 33-µm thick biaxial film of PBT yields a value ~1 order of magnitude larger than than for CS2. The measurements at two wavelengths suggest that they are nonresonant X(3) values. The measured anisotropy of X(3) as a function of angular orientation at two different sets of laser polarization is explained by using the tensor properties of X(3) in an anisotropic medium. The angular dependence and waveiength depen- dence for the degenerate four-wave mixing slgnal for the PBT film are shown in Fig. 1.
© 1986 Optical Society of America
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