Interaction of a smoothed laser beam with supercritical-density porous targets on the ABC facility

We present the results of experiments on the interaction of laser radiation with low-density porous targets performed on the ABC facility at the ENEA Research Centre (Frascati, Italy). Porous plastic targets with densities of 5 and 20 mg cm{sup -3} were irradiated by a focused neodymium-laser beam a...

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Bibliographic Details
Published inQuantum electronics (Woodbury, N.Y.) Vol. 36; no. 5; pp. 424 - 428
Main Authors Strangio, C, Caruso, A, Gus'kov, Sergei Yu, Rozanov, Vladislav B, Rupasov, A A
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 31.05.2006
Subjects
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CROSS SECTIONS
DENSITY
ELECTROMAGNETIC RADIATION
LASER RADIATION
LASER TARGETS
LASERS
LIGHT TRANSMISSION
MATERIALS
NEODYMIUM LASERS
OPTICAL SYSTEMS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOGRAPHY
PHOTON BEAMS
PHYSICAL PROPERTIES
PLASMA
PLASTICS
POLYMERS
POROUS MATERIALS
RADIATIONS
SOLID STATE LASERS
SYNTHETIC MATERIALS
TARGETS
TIME DEPENDENCE
TRANSMISSION
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Summary:We present the results of experiments on the interaction of laser radiation with low-density porous targets performed on the ABC facility at the ENEA Research Centre (Frascati, Italy). Porous plastic targets with densities of 5 and 20 mg cm{sup -3} were irradiated by a focused neodymium-laser beam at the fundamental frequency ({lambda} = 1.054 {mu}m) at a radiation intensity of 10{sup 13} W cm{sup -2} at the target. The beam was preliminarily allowed to pass through an optical system intended to spatially smooth the radiation intensity over the beam cross section. The use a smoothed beam was important to discover in the plasma and in the accelerated dense material the features related to the porous structure of the target under conditions which rule out the effect of the inhomogeneities of the heating beam itself. The spatial plasma structure in the laser beam-target interaction region and at the rear side of the target were investigated by using optical schlieren plasma photography. The time dependent transmission of the laser radiation through the target was also investigated by imaging the target in transmitted radiation to a properly masked photodiode. (interaction of laser radiation with matter. laser plasma)
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2006v036n05ABEH013241