Optical Investigations of Powerful Laser Actions on Massive and Flyer Targets

Journal Article · Sun Jan 15 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2168799· OSTI ID:20797968

Pisarczyk, T; Borodziuk, S; Kasperczuk, A ^[1]; Demchenko, N N; Gus'kov, S Yu ^[2]; Jungwirth, K; Kralikova, B; Krousky, E; Masek, K; Pfeifer, M; Rohlena, K; Rozanov, V B; Skala, J; Ullschmied, J ^[3]; Kalal, M ^[4]; Limpouch, J ^[3]; Pisarczyk, P ^[5]

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1. Institute of Plasma Physics and Laser Microfusion, 23 Hery St., 00-908 Warsaw (Poland)
2. P.N. Lebedev Physical Institute of RAS, 53 Leninsky Ave., 119 991 Moscow (Russian Federation)
3. PALS Research Center, AS CR, Na Slovance 3, 182 00 Prague 8 (Czech Republic)
4. Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1 (Czech Republic)
5. Warsaw University of Technology, ICS, 15/19 Nowowiejska St., 00-665 Warsaw (Poland)

In this paper we present experimental, theoretical, and computer simulation studies of craters formation produced by high power lasers in single and double layer targets. The experimental investigation was carried out using the PALS (Prague Asterix Laser System) facility working with two different laser beam wavelengths: {lambda}1 = 1.315 {mu}m and {lambda}3 0.438 {mu}m. Two types of targets made of Al were used: single massive targets, and double targets consisting of a foil or disk (6 {mu}m thick for both cases) placed in front of the massive target part at a distance of 200-500 {mu}m. Experiments with single massive targets were performed at laser intensities in the range of 1013-1015 W/cm2 by varying the laser beam diameters on the target surface from 70 {mu}m up to 1200 {mu}m (i.e. moving the target away from the focus). The double targets were illuminated by laser energies EL = 100-500 J focused always on a diameter of 250 {mu}m. In all experiments performed the laser pulse duration was equal to 400 ps. 3-frame interferometry was employed to investigate the plasma dynamics through measurements of the electron density distribution time development as well as of the disks and foil fragments velocities. The dimensions and shapes of craters were obtained by crater replica technology and microscopy measurement. The experiments were complemented by a 2-D analytical theory and computer simulations, which helped at interpretation of the results. This way the values of laser energy absorption coefficient, ablation loading efficiency and efficiency of energy transfer, as well as two-dimensional shock wave generation at the laser-driven macroparticle impact were obtained from the measured crater parameters for both the wavelengths of laser radiation.

• OSTI ID: 20797968
• Journal Information: AIP Conference Proceedings, Vol. 812, Issue 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168799; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
ABLATION
COMPUTERIZED SIMULATION
DISTRIBUTION
EFFICIENCY
ELECTRON DENSITY
ENERGY ABSORPTION
ENERGY TRANSFER
INTERFEROMETRY
LASER RADIATION
LASER-PRODUCED PLASMA
LASERS
LAYERS
PLASMA DIAGNOSTICS
PLASMA HEATING
PULSES
SHOCK WAVES
SURFACES
WAVELENGTHS