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Etude théorique et expérimentale des mécanismes de conversion des fréquences dans les cristaux photoniques non linéaires

Abstract : This work deals with the study of the mechanisms of frequency conversion in two-dimensional nonlinear photonic crystals. In particular, we have studied optical parametric (OPG) generation in square-lattice LiTaO3 crystals (PPLT-2D). We first focused on the theoretical and numerical study of PPLT-2D structures. A numerical study allowed us to understand the contribution of the reciprocal lattice vectors (kmn) for different types of gratting, in particular square and rectangular lattices. By numerical simulations, we also studied the influence of the incidence angle of the pump beam on the efficiency of the parametric conversion in these structures. Experimental measurements have allowed us to demonstrate, for the first time, the existence of several singularities where the signal is shared to generate two idlers and vice versa. Indeed, by analyzing the spectral and angular properties of the beams at the output of the crystal, we have experimentally and numerically identified the contributions involved in these common OPG processes. In addition, we studied the management of the optical parametric gain in a square lattice of PPLT-2D. The results show that the use of the non-collinear direction makes it possible to increase the gain according to two angles of incidence of the pump: 0.8 ° and 1.6 °. This implies, better conversion efficiency by minimizing the walk-off between the pump and the idler. Under these conditions, the gain could be close to that of the collinear direction. A good agreement was found between the experimental results and those of the simulation.
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Submitted on : Monday, April 23, 2018 - 5:30:05 PM
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Hocine Chikh-Touami. Etude théorique et expérimentale des mécanismes de conversion des fréquences dans les cristaux photoniques non linéaires. Science des matériaux [cond-mat.mtrl-sci]. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCD010⟩. ⟨tel-01774628⟩

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