A series of transparent silica films with organic chromophores as side
chain, main chain or cross-linking agent were prepared by the sol-gel
process. The resulting films heated at 100-120 degrees C under high c
orona field exhibited d(33) = 16-29 pm V-1 in Maker-fringe measurement
. The cross-linking type chromophore exhibited optimum poling orientat
ion stability. (C) 1997 Elsevier Science Ltd. All rights reserved.