Europhys. Lett.
Volume 61, Number 5, March 2003
Page(s) 632 - 638
Section Physics of gases, plasmas and electric discharges
Published online 01 February 2003
DOI: 10.1209/epl/i2003-00118-y
Europhys. Lett., 61 (5) , pp. 632-638 (2003)

Cerenkov radiation diagnostics of hot electrons generated by fs-laser interaction with solid targets

F. Brandl1, 2, G. Pretzler1, 2, D. Habs2 and E. Fill1

1  Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Str. 1, D-85748 Garching, Germany
2  Ludwig-Maximilians-Universität München Am Coulombwall 1, D-85748 Garching, Germany

(Received 5 August 2002; accepted in final form 13 December 2002)

A new method of diagnostics of hot electrons from a laser-produced plasma is experimentally demonstrated. Titanium-sapphire laser pulses (1 $\un{J}$/130 $\un{fs}$) irradiate copper foils backed by a dielectric. The energy distribution and direction of the hot electrons generated is determined by recording visible Cerenkov radiation with spatial resolution. The results demonstrate a change in the electron generation mechanism at relativistic intensities.

52.50.Jm - Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.).
52.59.-f - Intense particle beams and radiation sources.
52.70.Kz - Optical (ultraviolet, visible, infrared) measurements.

© EDP Sciences 2003