Abstract
We report on the experimental evaluation of the intensity-dependent index of refraction of a new family of polymers, using guided-wave techniques. The materials are 'DANx-polymers', and the measurements were performed at 1.064 µm with 30 ps pulses employing nonlinear distributed grating coupling into spin coated planar waveguides. The analysis shows large electronic and nonresonant n2 coefficients. The examined materials have outstanding potentialities for all-optical signal processing in an integrated optics format.

Abstract
Optical third harmonic generation at 1.904, 1.579 and 1.064 µm experiments have been performed on thin films fabricated from side chain polymers containing effectively 4-dialkylamino-nitro-benzene, 4-dialkylamino-4'-nitro-stilbene, 4-dialkylamino-4'-nitro-diphenylbutadiene, 4-dialkylamino-4'-nitro-diphenylhexatriene as the side groups. We have measured values of ?(3) (-3?; ?, ?, ?) in the range of 0.54 × 10-12 to 7.42 × 10-12 esu, at 1.904 µm incident radiation, which are comparable to the nonresonant values found in fully conjugated back-bone polymers [1]. The values of ?(3) at both 1.904 and 1.579 µm change by a factor of 15 as the conjugation length is increased. © 1990.

Abstract