Time-resolved visualization of electric fields during femtosecond laser ablation

Christoph T. Hebeisen; Germán Sciaini; Maher Harb; Ralph Ernstorfer; Sergei G. Kruglik; R. J. Dwayne Miller

doi:10.1117/12.803889

11 August 2008 Time-resolved visualization of electric fields during femtosecond laser ablation

Christoph T. Hebeisen, Germán Sciaini, Maher Harb, Ralph Ernstorfer, Sergei G. Kruglik, R. J. Dwayne Miller

Proceedings Volume 7099, Photonics North 2008; 70992F (2008) https://doi.org/10.1117/12.803889
Event: Photonics North 2008, 2008, Montréal, Canada

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.

Citation Download Citation

Christoph T. Hebeisen, Germán Sciaini, Maher Harb, Ralph Ernstorfer, Sergei G. Kruglik, and R. J. Dwayne Miller "Time-resolved visualization of electric fields during femtosecond laser ablation", Proc. SPIE 7099, Photonics North 2008, 70992F (11 August 2008); https://doi.org/10.1117/12.803889

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