This article is cited in 4 papers

Interaction of laser radiation with matter. Laser plasma

Energetic electrons and x-ray photons from multiterawatt Ti:sapphire lasers

P. V. Nickles^a, M. P. Kalachnikov^a, P. J. Warwick^a, K. A. Janulewicz^a, W. Sandner^a, U. Jahnke^b, D. Hilscher^b, M. Schnurer^c, R. Nolte^d, A. Rousse<sup>e

a</sup> Max Born Institute, Berlin, Germany
^b Hahn-Meitner-Institut, Berlin, Germany
^c Technische Universitat Wien, Vienna, Austria
^d Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
^e Laboratoire d'Optique Appliquee, ENSTA-Centre del'Yvette, Palaiseau, France

Abstract: The energy distribution and yield of electrons and hard x-ray photons were investigated by irradiating tungsten and tantalum targets with ~ 30 fs pulses in the intensity range 10¹⁸ — 10¹⁹ W cm^–2 by using the Laboratoire d'Optique Appliquee (LOA) as well as the Max Born Institut (MBI) multiterawatt Ti:sapphire lasers. For the measurement of the hard x-ray emission in the energy range from 15 keV to 700 keV at the LOA a 9-channel spectrometer of calibrated thermoluminescence detectors (TLD) was used. The scaling of the hard x-rays was studied by varying the incident laser energy within one order of magnitude and the pulsewidth by a factor of 5. The hot electron output was investigated in the range 300 keV — 1 MeV with the new MBI Ti:sapphire laser by using a time-of-flight spectrometer. The results indicate a sensitive interplay between the temporal laser shape and laser intensity.

PACS: 52.25.Nr, 52.25.Tx, 07.85.Fv, 42.55.Rz

Received: 21.12.1998

 English version: Quantum Electronics, 1999, 29:5, 444–448

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