The spatially varying polarization of a focused Gaussian beam in quasi-phase-matched superlattice under electro-optic effect.

We present in this paper a wave coupling theory of linear electr-ooptic (EO) effect for quasi-phase matched (QPM) of focused Gaussian beam in an optical superlattice (OSL). The numerical results indicate that, due to the EO effect of an appropriate applied electric field, the output beam will form spatially inhomogeneous polarization, changing continuously in transverse section of beam; the confocal parameter has a significant impact on the output polarization of Gaussian beam and determines the half-wave voltage. (C) 2010 Optical Society of America