Abstract

Experimental observations on the structure of photorefractive subharmonic domains in Bi₁₂SiO_2o (BSO) generated by a running intensity grating are described. The near field structure of the domains explains experimental observations of far field beam broadening and shift and the difference between the subharmonic beams in the beamcoupling and non-beam coupling geometries of BSO. The phenomena called ”low frequency resoance” and ”subharmonics” are described as analogous to second harmonic generation and degenerate optical parametric oscillation in ordinary χ⁽²⁾-nonlinear optics.

© 1999 Optical Society of America