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Étude expérimentale de l'effet de focalisation sur le claquage laser sous atmosphères d'argon

Abstract : Laser induced breakdown is commonly used in Laser Induced Breakdown Spectroscopy (LIBS) to characterize materials (temperature, electronic density …) and also to ignite gaseous mixtures. In spectroscopic applications it is necessary to collect the emitted light from the laser spark (in plasma state), which implies an a priori knowledge of its spatial position. However, the laser spark can move along the laser axis around the focal point due to the used optical focalization parameters. To our knowledge this phenomenon has been observed but never specifically studied. The purpose of this experimental work is to study the spatial reproducibility of the laser induced breakdown in a controlled atmosphere of argon for several pressures and two different focalization parameters for a given laser energy, and at a wavelength of 532 nm.
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Submitted on : Tuesday, May 12, 2020 - 3:46:22 PM
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  • HAL Id : hal-02571016, version 1

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Steve Rudz, Maxime Wartel, Mamadou Sankhe, Stéphane Pellerin, Jean-Luc Hanus. Étude expérimentale de l'effet de focalisation sur le claquage laser sous atmosphères d'argon. 24ième Congrès Français de Mécanique, Aug 2019, Brest, France. ⟨hal-02571016⟩

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