Čerenkov waveguide SHG: a less critical way to reach the efficiency peak

L. Kotačka, J. Čtyroký , H.J.W.M. Hoekstra

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    It is well known that the conversion efficiency of the SHG in the Cerenkov regime in a waveguide with a nonlinear substrate exhibits a very sharp peak. Its position in a "pump wavelength-guide thickness" diagram follows a modified dispersion relation. A particular material combination exactly determines both the pump wavelength and the guide thickness. The existence of the peak was also experimentally proved with relatively high normalised conversion efficiency of 210%(cmW). However, in order to achieve such a high conversion efficiency, the required tolerance in the guide thickness should be smaller than 0.5nm (the FWHM of the peak is approximately 0.8 nm). The allowed variations in refractive indices are also very low (< 10-3). The recent theoretical study of the authors showed that an additional layer (idler) inserted into the waveguide facilitates more degrees of freedom which could relax the conditions for reaching the efficiency peak. This paper presents a detailed study of the behaviour of four-layer waveguide devices with a nonlinear substrate which promise a less constrained way to reach the efficiency peak
    Original languageEnglish
    Title of host publicationV International Workshop on Nonlinear Optics Applications, NOA 2000
    Subtitle of host publicationGrybów, Poland, June 8-11, 2000: Proceedings
    Place of PublicationWarsaw, Poland
    PublisherWarsaw University of Technology
    Publication statusPublished - 8 Jun 2000


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