Abstract
Optical second-harmonic generation (SHG) is studied for the confined geometry of a circular cylindrical waveguide or optical fiber. A model situation of high symmetry is considered where the material with nonlinear susceptibility is isotropic and distributed in radially symmetric manner about the axis. In addition it is assumed that the material of high second-order nonlinearity consists of a thin circular layer, with periodic variation in the axial direction - similar to a usual quasi-phasematched configuration. One can optimize the efficiency of SHG by choosing the period of the array such that a Bragg condition is satisfied. Depletion is studied in the framework of mode-coupling theory. ?
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