Iizuka, TsuyoshiKivshar, Yuri2015-12-132015-12-130031-9007http://hdl.handle.net/1885/93477We demonstrate an important role of the process of optical rectification in the theory of nonlinear wave propagation in quadratically nonlinear [or χ(2)] periodic optical media. We derive a novel physical model for gap solitons in χ(2) nonlinear Bragg g19992015-12-12