NERADOVSKAIA , Elizaveta

The study of the evolution of the domain structure in ferroelectric crystals is extremely important from a fundamental and applied point of view. Scanning probe microscopy provides a unique opportunity for local investigation of the processes of polarization reversal, the results of which can be used to optimize the classical methods of domain...

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The nonlinear refractive indices ( n 2 ) of a selection of bulk (LiB 3 O 5 , KTiOAsO 4 , MgO:LiNbO 3 , LiGaS 2 , ZnSe) and liquid (E7, MLC2132) crystals are measured at 1030 nm in the sub-picosecond regime (200 fs) by nonlinear chirped interferometry. The reported values provide key parameters for the design of near- to mid-infrared parametric...

Imperfections of the periodic material impact the performances of Quasi Phase Matched devices. Our numerical study allows predicting the impact of stitching errors on the nonlinear interactions in waveguides using domains induced by e-beam writing in Lithium Niobate and explaining the observed experimental results.

Four-wave mixing processes are ubiquitous in ultrafast optics and the determination of the coefficients of the $\chi^{(3)}$ tensor is thus essential. We introduce a novel time-resolved ultrafast spectroscopic method to characterize the third-order nonlinearity on the femtosecond time-scale. This approach, coined as "nonlinear chirped Doppler...

We report a novel jitter-free ultrafast spectroscopy method to investigate third-order nonlinearity. The method is applied to assess the nonlinear refractive indices of ori-entated, nematic liquid crystals in the femtosecond regime.

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...

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