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Proceedings Paper

Time-resolved visualization of electric fields during femtosecond laser ablation
Author(s): Christoph T. Hebeisen; Germán Sciaini; Maher Harb; Ralph Ernstorfer; Sergei G. Kruglik; R. J. Dwayne Miller
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Paper Abstract

We observe the electric fields caused by charge distributions during femtosecond laser ablation from a silicon (100) surface. Femtosecond electron pulses passing near the ablation site serve as a probe of the electric field generated by the emitted charges and countercharges on the sample surface. The density map of the electron pulse downstream from the sample contains information about the charge distributions. We invert this information by fitting the beam maps using a simple charge distribution model. Under the present excitation conditions (390 nm, 150 fs, 5.6 J/cm2), we observe the emission of 5.3×1011 electrons/cm2 within 3 ps of the excitation pulse, leading to self-acceleration of the emitted electrons to 2% of the speed of light. Preliminary experiments on a metal sample display even faster dynamics.

Paper Details

Date Published: 11 August 2008
PDF: 9 pages
Proc. SPIE 7099, Photonics North 2008, 70992F (11 August 2008); doi: 10.1117/12.803889
Show Author Affiliations
Christoph T. Hebeisen, Univ. of Toronto (Canada)
Germán Sciaini, Univ. of Toronto (Canada)
Maher Harb, Univ. of Toronto (Canada)
Ralph Ernstorfer, Univ. of Toronto (Canada)
Sergei G. Kruglik, Univ. of Toronto (Canada)
R. J. Dwayne Miller, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 7099:
Photonics North 2008
Réal Vallée; Michel Piché; Peter Mascher; Pavel Cheben; Daniel Côté; Sophie LaRochelle; Henry P. Schriemer; Jacques Albert; Tsuneyuki Ozaki, Editor(s)

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