The electro-optic effect of periodically poled optical superlattice LiNbO3
(PPLN) was studied. Because of the periodic electro-optic (EO) coefficient,
the reciprocal vector of the periodic structure can be used to compensate
for the phase mismatch between the ordinary and extraordinary waves, which
is similar to the nonlinear optical frequency conversion process. If the qu
asi-phase-matching condition is satisfied, polarization of a light propagat
ed in PPLN can rotate linearly with the applied electric field, which shows
that PPLN may be used as a precise spectral filter or an EO switch. (C) 20
00 American Institute of Physics. [S0003- 6951(00)04848-8].