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Etude et caractérisation optique linéaire et non-linéaire de guides d'onde plans fabriqués par implantation d'hélium (He+) et de protons (H+) dans KTiOPO4 (KTP)

Abstract : The increasing technological needs in the information optical processing and biomedical lasers encourage the elaboration of integrated optoelectronic components and micro-lasers emitting in the visible and UV spectrum. With frequency doubling in highly non-linear optical materials, it is possible to reach high conversion efficiencies. KTiOP04 (KTP) is one of the reference materials in non-linear guided optics. In this work, we have characterized the linear and non-linear optical properties of planar waveguides made in KTP by H+and He+ implantation. Three experimental techniques have been used : the dark lines spectroscopy, the second harmonic generation in total reflection (SHEW) and the second harmonic generation by reflection on the waveguide edge (MSHG). The first one leads to determine the optogeometrical parameters of the studied waveguides. The SHEW technique has enabled to study the implantation effects on the surface non-linear optical properties of these waveguides. The MSHG technique that was the object of an experimental set-up we realized enabled to investigate the implantation effects on the volume optical non-linear properties of the samples. The linear optical characterization did not show any guided mode in (Z-cut) KTP wafers implanted with H+. In the case of He+ implantation, light is better confined in Nz excitation than in Nx or Ny one. The KTP crystal anisotropy is preserved after He+ implantation. The multiple implantation led to the elaboration of waveguides with H+, for the first time in KTP (Y-cut) wafers, and to the improvement of their optical performances with He+, in KTP (Y-cut) wafers. Losses were estimated <5 dB.cm-1 in KTP:H+ and <3 dB.cm-1 in KTP:He+ with TM polarisation (Nz). With the SHEW technique, the surface non-linear properties are far more reduced with high ionic implanted doses. The use of the MSHG technique has shown in KTP (Z-cut):H+, the existence of a perturbation at 117 [mu]m depth that could be due to the presence of an optical barrier. This observation could therefore explain the absence of guided mode in this sample. This technique has also shown that the optical non-linearity is reduced on a variable depth in the guiding area in H+ and He+ implanted waveguides whereas, in comparaison with RB exchanged KTP waveguides, it is strongly perturbated. Light ions implantation is therefore a promising technique to make waveguides. Moreover, this study lets to foresee the fiequency doubhg realisation with high conversion efficiencies into H+ implanted KTP waveguides by Quasi-Phase Matching (QPM) technique
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https://hal.univ-lorraine.fr/tel-01775781
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Submitted on : Tuesday, April 24, 2018 - 3:42:50 PM
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  • HAL Id : tel-01775781, version 1

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Philippe Bindner. Etude et caractérisation optique linéaire et non-linéaire de guides d'onde plans fabriqués par implantation d'hélium (He+) et de protons (H+) dans KTiOPO4 (KTP). Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1999. Français. ⟨NNT : 1999METZ044S⟩. ⟨tel-01775781⟩

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