We present here a class of processible donor-embedded nonlinear optical (NL
O) polyimides exhibiting the high glass-transition temperature and exceptio
nal thermal and chemical stability. Due to the rigidity of the donor-embedd
ed structure, the stability of the electric field induced dipole orientatio
n of the NLO chromophores was enhanced. A sizable second-order nonlinear op
tical coefficient was obtained. (C) 1999 Elsevier Science Ltd. All rights r
eserved.