Multispecies stagnation layer study in colliding laser produced plasmas

Shilpa S.; Pramod Gopinath

doi:10.1117/12.2669944

11 May 2023 Multispecies stagnation layer study in colliding laser produced plasmas

Shilpa S., Pramod Gopinath

Proceedings Volume 12638, Women in Optics and Photonics in India 2022; 126380F (2023) https://doi.org/10.1117/12.2669944
Event: Women in Optics and Photonics in India, 2022, Bangalore, India

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Abstract

The propagation dynamics of aluminium-copper colliding laser produced plasma plumes are studied by using time-gated fast imaging and optical emission spectroscopic techniques. The experiment is performed at 10-2 mbar of air ambient. Angular target geometry is employed for the efficient collision of two different laser produced plasmas. When two plasmas collide, it can either stagnate at the collision front or can interpenetrate each other. The dense layer of plasma stagnates at the interaction region called the stagnation layer. Multi species stagnation region is formed at the collision front of heterogeneous colliding laser produced plasma and its time-resolved expansion dynamics are analyzed. The emission intensities are different for the two materials. For a particular laser wavelength, the two metal targets have different thermal and optical properties and thereby different ablation rates. Al with less ablation threshold has more intense emission compare to that of Cu. Plasma parameters like electron density and electron temperature are also measured from the optical emission spectroscopic data.

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Shilpa S. and Pramod Gopinath "Multispecies stagnation layer study in colliding laser produced plasmas", Proc. SPIE 12638, Women in Optics and Photonics in India 2022, 126380F (11 May 2023); https://doi.org/10.1117/12.2669944

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