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Theses

Métrologie ultrarapide : application aux dynamiques laser et à l'imagerie

Abstract : This PhD work is dedicated to optical characterization in real time. Ultrafast metrology tools have thus been used to study a pulsed laser source and also for physical phenomena imaging. The implementation of a temporally well characterized pulsed laser source allowed the observation of events involving abnormally high intensity, the dynamics of which have also been numerically studied and confirmed. Understanding of these phenomena addresses a fundamental and interesting need to prevent optical damage in laser sources. The use of the imaging technique called “time-stretch imaging” allowed the imaging of liquid sprays at an 80MHz repetition rate. Based on Dispersive Fourier Transform, this technique enables the study of non-repetitive events at high sampling frequency, and thus goes beyond the performance of traditional imaging devices. This technique also allowed the tracking of shockwaves, and thus profiling the shockwave’s velocity variation through its propagation along a certain measuring distance. Shockwave reflection has also been observed.
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Submitted on : Tuesday, October 23, 2018 - 4:31:08 PM
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  • HAL Id : tel-01902656, version 1

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Pierre-Henry Hanzard. Métrologie ultrarapide : application aux dynamiques laser et à l'imagerie. Optique [physics.optics]. Normandie Université, 2018. Français. ⟨NNT : 2018NORMR042⟩. ⟨tel-01902656⟩

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