| Autor: |
Kai Y, Lem J, Ossiander M, Meretska ML, Sokurenko V, Kooi SE, Capasso F, Nelson KA, Pezeril T |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2023 Sep 11; Vol. 31 (19), pp. 31308-31315. |
| DOI: |
10.1364/OE.487894 |
| Abstrakt: |
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/cm 2 , 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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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