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Laser-driven detonation wave in hafnium oxide film: Defect controlled laser damage and ablation

Authors :
Yejia Xu
Luke A. Emmert
David H. Dunlap
Wolfgang Rudolph
Source :
Journal of Applied Physics. 128:123101
Publication Year :
2020
Publisher :
AIP Publishing, 2020.

Abstract

An ion-beam sputtered film of hafnium oxide was irradiated with an intense nanosecond laser pulse above the ablation threshold. The transmitted laser power was measured as a function of time, with a resolution of a few hundred picoseconds. The spatial origin of the defect-triggered ablation was monitored for each event. A phenomenological model of a rapidly expanding, absorbing disk can explain the observed time dependent transmission and structure sizes of the affected material. The required expansion speeds, ranging from 1 to 100 km/s, and their observed dependence on the local laser intensity, are compatible with a laser-driven detonation wave as described by the Chapman–Jouget (CJ) theory. Because the energy deposited by the laser pulse is too low to explain detonation in a material with the density of hafnium oxide, we hypothesize that the detonation wave propagates in the electron–hole subspace. We modified the CJ theory to describe laser-driven detonation in an electron–hole plasma and to account for plasma expansion sideways to the laser beam.

Details

ISSN :
10897550 and 00218979
Volume :
128
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........c9c227010df1614957b19e5f163f4a31
Full Text :
https://doi.org/10.1063/5.0015406