M. B. Agranat, N. E. Andreev, S. I. Ashitkov, A. V. Ovchinnikov, D. S. Sitnikov, V. E. Fortov, A. P. Shevel'ko, “Generation of characteristic x rays by a terawatt femtosecond chromium-forsterite laser”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2006, Volume 83, Issue 2,Pages <nobr>80

This article is cited in 18 papers

ATOMS, SPECTRA, RADIATIONS

Generation of characteristic x rays by a terawatt femtosecond chromium-forsterite laser

M. B. Agranat^a, N. E. Andreev^a, S. I. Ashitkov^a, A. V. Ovchinnikov^a, D. S. Sitnikov^a, V. E. Fortov^a, A. P. Shevel'ko^ba

^a Institute of Extremal States Thermophysics, Scientific Association for High Temperatures, Russian Academy of Sciences
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences

Abstract: Characteristic K _α x rays arising when a metallic target is irradiated by femtosecond infrared pulses that are generated by a terawatt chromium-forsterite laser system (1240 nm, 90 mJ, 80 fs) are studied. The absolute yield (up to 3 × 10⁸ photons/sr pulse) and the coefficient of the transformation of laser radiation to K _α radiation (maximum value ≈0.03%) are measured for an iron target. The dependence of the radiation intensity on the angle of incidence of p polarized laser radiation is analyzed. The mechanisms of the production of fast electrons responsible for generating characteristic x rays are discussed.

PACS: 42.65.Re, 52.59.Px, 52.65.-y

Received: 11.04.2005
Revised: 16.12.2005