Manipulation et caractérisation du champ électrique optique: applications aux impulsions femtosecondes

Abstract : This thesis deals with femtosecond pulse shaping and temporal characterization. The originality of the work resides in the proposed approach in which metrology plays the essential role. The thesis' first part addresses the problem of the theoretical and experimental limitations of short pulse shaping via an Acousto-Optic Programmable Dispersive Filter (AOPDF). A detailed and accurate analysis of the device was performed by spectral interferometry to determine its precision. An essential step in this work consisted in characterizing the precision available through spectral interferometry beforehand. A systematic study of the precision of first to fourth-order polynomial phases generated with the AOPDF was then undertaken. The main factors responsible for the observed discrepancies between the programmed and applied phases are presented and discussed. A method is proposed to correct them. The second part of the thesis is devoted to the study of three different pulse characterization techniques: a reference one, " Spectral Phase Interferometry for Direct Electric-field Reconstruction " (SPIDER) and two others developed during the thesis: " Local Spectral Compression " (LSC) and " Self-Referenced Spectral Interferometry " (SRSI). The precision of the measurement of quadratic and cubic phases generated with the AOPDF was determined for each method. All of these precisions were compared with each other. Pulses were also compressed to their Fourier limit using a feedback loop between the LSC device and an AOPDF first, and secondly the SRSI device and an AOPDF. Finally, each technique's advantages and limitations are discussed.
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Stéphanie Grabielle. Manipulation et caractérisation du champ électrique optique: applications aux impulsions femtosecondes. Optique [physics.optics]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00680293⟩

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