Relative contribution of the electric-field-induced third-order effect to second-harmonic generation in poled, doped, amorphous polymers. Dhinojwala, Ali; Wong, George K.; Torkelson, John M. Department of Chemical Engineering, Northwestern University, Evanston, IL, USA. J. Opt. Soc. Am. B (1994), 11(9), 1549-1554. CODEN: JOBPDE ISSN: 0740-3224. Journal written in English. CAN 121:311195 AN 1994:711195 CAPLUS

A novel approach involving a delay-trigger method and doped, glassy polymers has been developed to det. the contribution of the elec.-field-induced third-order effect to the second-order macroscopic susceptibility c(2) of nonlinear optical dyes. A submillisecond, variable time delay is employed for switching on or off the elec. poling field with respect to the laser pulse. For the several dyes tested at 30 °C the contribution of the elec.-field-induced third-order effect (second-harmonic wavelength = 532 nm) ranges from (6 ± 2)% of c(2) 4-(dimethylamino)benzylidenemalononitrile to (20 ± 3)% of c(2) for 4-(dimethylamino)-4'-nitrostilbene.