Electronic nonlinear optical behaviour of a grating coupled polymer (4BCMU) waveguide

The nonlinear optical properties of polydiacetylene (PDA) are of interest both fundamentally and technologically. The nonresonant third order susceptibility /spl chi//sup (3)/ associated with the nonlinear refractive index n/sub 2/ has been found to be relatively large (>10/sup -11/ esu) and ultra-fast (<1 ps). Here we show how the reflectivity response of a grating coupled PDA waveguide can be analysed to yield both the real and the imaginary parts of /spl chi//sup (3)/ in a single experiment with the sample in thin film form.<
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