The search for highly nonlinear third-order picosecond optical materials finds candidates in 1-Dπ-conjugated semiconducting polymers.1 In n-level systems, we have demonstrated that all so-called electronic degenerate intensity-dependent nonlinear optical susceptibilities leading to degenerate four-wave mixing can be readily estimated and related directly to optical Stark shifts.2

© 1989 Optical Society of America

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