Abstract
We report the experimental evaluation of the intensity-dependent index of refraction of a new class of third order nonlinear materials, side chain polymers containing 4-dialkylamino-4′-nitro-stilbene and 4-dialkylamino-4′-nitro-diphenylbutadiene as side groups. The measurements, based on nonlinear grating coupling into planar waveguides with 30 ps pulses at 1.064 μm, showed large electronic nonresonant n2 Kerr coefficients.
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