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Article Dans Une Revue Optics Express Année : 2023

High-power laser beam shaping using a metasurface for shock excitation and focusing at the microscale

Résumé

Achieving high repeatability and efficiency in laser-induced strong shock wave excitation remains a significant technical challenge, as evidenced by the extensive efforts undertaken at large-scale national laboratories to optimize the compression of light element pellets. In this study, we propose and model a novel optical design for generating strong shocks at a tabletop scale. Our approach leverages the spatial and temporal shaping of multiple laser pulses to form concentric laser rings on condensed matter samples. Each laser ring initiates a two-dimensional focusing shock wave that overlaps and converges with preceding shock waves at a central point within the ring. We present preliminary experimental results for a single ring configuration. To enable high-power laser focusing at the micron scale, we demonstrate experimentally the feasibility of employing dielectric metasurfaces with exceptional damage threshold, experimentally determined to be 1.1 J/cm2, as replacements for conventional optics. These metasurfaces enable the creation of pristine, high-fluence laser rings essential for launching stable shock waves in materials. Herein, we showcase results obtained using a water sample, achieving shock pressures in the gigapascal (GPa) range. Our findings provide a promising pathway towards the application of laser-induced strong shock compression in condensed matter at the microscale.

Dates et versions

hal-03835854 , version 1 (01-11-2022)

Identifiants

Citer

Yun Kai, Jet Lem, Vyacheslav Sokurenko, Steven E. Kooi, Keith A. Nelson, et al.. High-power laser beam shaping using a metasurface for shock excitation and focusing at the microscale. Optics Express, 2023, 31 (19), pp.31308. ⟨10.1364/OE.487894⟩. ⟨hal-03835854⟩
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