Spall-Velocity Reduction in Double-Pulse Impact on Tin Microdroplets

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Abstract

We explore the deformation of tin microdroplets of various diameters induced by two consecutive laser pulses having pulse durations of 0.4 ns. Impact of laser pulses with this duration mainly leads to shock-wave-induced cavitation and spallation. The main result obtained in this work is the observation of a strong reduction of the spall velocity that depends on the time delay between the two pulses. This reduction reveals a complex interplay between plasma recoil pressure and shock-wave-driven deformation, and enables an estimation of the moment of spall formation and the average shock-wave propagation velocity. We find that the shock wave traverses the droplet with an average velocity ranging from 1.2 to 1.6 times the speed of sound. We study the effects of the energy of the second pulse on the deformation and qualitatively discuss the formation of microjets. Crucially, we demonstrate the ability to manipulate the microdroplet expansion and spallation with double-pulse sequences, thereby increasing the portfolio of obtainable target shapes for droplet-based extreme ultraviolet light sources.

Original languageEnglish
Article number024026
Pages (from-to)1-11
Number of pages11
JournalPhysical Review Applied
Volume16
Issue number2
Early online date16 Aug 2021
DOIs
Publication statusPublished - Aug 2021

Bibliographical note

Funding Information:
We thank the anonymous reviewer for their highly constructive feedback. This work has been carried out at the Advanced Research Center for Nanolithography (ARCNL), a public-private partnership of the University of Amsterdam (UvA), the Vrije Universiteit Amsterdam (VU), the Netherlands Organisation for Scientific Research (NWO), and the semiconductor equipment manufacturer ASML.

Publisher Copyright:
© 2021 American Physical Society.

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