Additive laser excitation of multiple surface acoustic waves up to the nonlinear shock regime

Deschamps, Jude; Yu, Kai; Lem, Jet; Chaban, Ievgeniia; Lomonosov, Alexey M.; Anane, A.; Kooi, Steven E.; Nelson, Keith A.; Pézeril, Thomas

doi:10.48550/arxiv.2209.13897

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…See Ref. [20] for a 1D demonstration of spatial tuning and superposition of multiple acoustic waves excited by an array of laser photoacoustic sources shaped as lines.…”

Section: Design 1: Axicon Cavitymentioning

confidence: 99%

Design of Novel Optical Cavities for Strong Shock Compression

Yu¹,

Lem²,

Sokurenko³

et al. 2022

Preprint

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Laser-induced strong shock with high efficiency remains a technical challenge, evidenced by the fact that much effort is being invested at the large-scale national laboratories to optimize the laser-induced shock compression of pellets consisting of light elements. However, techniques developed at national laboratories are rarely transferable to university laboratories. Here, we present theoretical work on the design of novel optical cavities intended for strong shock generation at a tabletop scale. The key idea is to utilize multiple laser pulses spatially shaped to form concentric laser rings on condensed matter samples. Each laser ring launches a 2D focusing pressure wave that converges at the common central point. The pulses are delayed in the nanosecond range and spaced by microns, matching the laser scanning speed to the shock speed, which is typically several µm/ns in condensed matter, allowing the pressure waves to superimpose to achieve extremely high pressure. The hereby designed optical cavities are expected to maintain or even exceed the shock excitation efficiency of 10 4 GPa/J reported in our previous work using a single laser ring, where the limiting factor to generate stronger shocks was the saturation of input laser energy. The current design for multiple laser rings bypasses the saturation due to much larger excitation areas, thus the total input laser energy can be dramatically increased. Our work provides a viable pathway toward the application of laser-induced strong shock compression of condensed matters. The current tabletop scheme caters to the need of the shock compression community by providing the flexibility, in contrast to large-scale national labs, to test new shock compression strategies.

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“…See Ref. [20] for a 1D demonstration of spatial tuning and superposition of multiple acoustic waves excited by an array of laser photoacoustic sources shaped as lines.…”

Section: Design 1: Axicon Cavitymentioning

confidence: 99%

Design of Novel Optical Cavities for Strong Shock Compression

Yu¹,

Lem²,

Sokurenko³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

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

Yu¹,

Lem²,

Ossiander³

et al. 2023

Opt. Express

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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.

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Additive laser excitation of multiple surface acoustic waves up to the nonlinear shock regime

Cited by 2 publications

References 33 publications

Design of Novel Optical Cavities for Strong Shock Compression

Design of Novel Optical Cavities for Strong Shock Compression

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

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