Studies of ultrafast laser-produced X-ray sources
- Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605 CNRS, Ecole Polytechnique, 91128 Palaiseau (France)
- Laboratoire d'Optique Appliquee, UMR 7639 CNRS, Rue de la Huniere, 91167 Palaiseau (France)
Experimental efforts have started for bringing (sub-) picosecond time resolution in pump-probe X-ray diffraction and absorption spectroscopy of transient chemical, biological or physical phenomena. Among the various pulsed X-ray sources available, ultrafast laser-produced plasmas are very promising for the generation of subpicosecond X-rays. We have significantly progressed toward a better understanding of ultrafast ({approx_equal}100 fs) laser-matter interaction at moderate ({approx_equal}5x10{sup 16} W/cm{sup 2}) intensities. We have found that fast electron production and non-thermal K{sub {alpha}} emission peak for a plasma scale length where resonance absorption is maximized. The plasma scale length can be efficiently controlled by using a prepulse of variable relative intensity and delay. Targets of different substrate and overcoat layer materials have been used to obtain informations on the anisotropy of the electron distribution function and on hot electron energy transport. Experimental results are found in satisfactory good agreement with 1-D hydrodynamic and particle-in-cell simulations.
- OSTI ID:
- 21202611
- Journal Information:
- AIP Conference Proceedings, Vol. 443, Issue 1; Conference: International conference on atomic processes in plasmas, Auburn, AL (United States), 23-26 Mar 1998; Other Information: DOI: 10.1063/1.56560; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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