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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/372

Title: Coupled mode analysis to study cascading in the QPM Cerenkov regime in waveguides
Authors: Thyagarajan, K
Vaya, Minu
Arun Kumar
Keywords: QPMC
efficiencies
nonlinear phase
harmonic radiation
tolerance
wavelength
Issue Date: 1997
Citation: Optics communications, 140, 316-322
Abstract: In this paper we use the coupled mode analysis to study nonlinear phase shifts of the fundamental beam caused by cascaded second order nonlinear effects in the Quasi Phase Matched Cerenkov (QPMC) configuration in waveguides. Under the no-pump depletion approximation which is valid for low conversion efficiencies, we obtain the nonlinear phase shift as a function of length of interaction and grating period. It is observed that the nonlinear phase shift of the fundamental beam can be maximized by choosing a grating period for which the phase matched second harmonic radiation mode is radiated parallel to the film-substrate interface, i.e., for zero Cerenkov angle. Although the phase shifts are smaller than in the case of all guided geometry, QPM Cerenkov configuration is expected to have greater tolerance towards various waveguide parameters and the fundamental wavelength.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/372
Appears in Collections:Physics

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