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Pré-Publication, Document De Travail Année : 2017

Second Harmonic Generation in PPLN waveguides with stitching errors

Elizaveta Neradovskaia
  • Fonction : Auteur
Vladimir Ya. Shur
  • Fonction : Auteur
  • PersonId : 944074
Florent Doutre
Getachew Ayenew
  • Fonction : Auteur
Marc de Micheli

Résumé

Depending on the chosen fabrication process, nonlinear waveguides realized in periodically oriented material such as PPLN can present different fabrication errors. In this paper we present a detailed numerical study of the impact on the nonlinear performances of one or several stitching errors occurring during the realization of the periodic domains by e-beam writing. This study shows that contrarily to what was expected, a single finite stitching error does not simply decrease the nonlinear efficiency, but splits the SH signal into a double peak spectrum, where the position of the peaks and their width at half maximum depend not only on the poling period, the total length of the grating, and the waveguide parameters but also on the amplitude and the position of the defect. The numerical results are confirmed by SHG experiments performed in PPLN waveguides obtained by Soft Proton Exchange and where the nonlinear grating was composed of one to four e-beam written 1.5 mm long PPLN sections between which important stitching error can occur. It is worthnoting that similar errors (domains merging or missing domains) can occur also in e-field poling process but they are randomly distributed along the propagation path. Therefore this study is a first attempt to take them into account to explain experimental results and indicate the steps that have to be taken to improve the quality of the components.
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Dates et versions

hal-01636585 , version 1 (16-11-2017)

Identifiants

  • HAL Id : hal-01636585 , version 1

Citer

Maxim Neradovskiy, Elizaveta Neradovskaia, Dmitry S. Chezganov, Vladimir Ya. Shur, Hervé Tronche, et al.. Second Harmonic Generation in PPLN waveguides with stitching errors. 2017. ⟨hal-01636585⟩
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