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Passage of laser light through a hole-plasma shutter

Published online by Cambridge University Press:  09 March 2009

K. Mašek
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
B. Králiková
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
J. Krása
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
L. Láska
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
K. Rohlena
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
J. Skála
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
O. Štirand
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
P. Trenda
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
B. Rus
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18040 Prague 8, Czech Republic
A.V. Bessarab
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
S.G. Garanin
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
G.A. Kirillov
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
Yu.F. Kiryanov
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
G.G. Kochemasov
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
A.B. Ryadov
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
S.A. Sukharev
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
N.A. Suslov
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia
A.I. Zaretskii
Affiliation:
VNIIEF Arzamas-16, Nizhnii Novgorod Region, Russia

Abstract

The interaction of a plasma produced by irradiation of perforated foils with laser pulses was studied. The laser beam of the first harmonics of the iodine laser (λ = 1.315 μm) system PERUN was focused by anf/2 optics (f = 20 cm) on a hole in the foil target of high-Z material. The laser energy and the temporal shape of the pulses were monitored both before and behind the hole. Foils of two different materials (Pb, Cu) were used, and a series of hole diameters 2rH ranging from 100 μm to 500 μm were tested. The diameter of the laser focal spot 2r0 was about 150 μm. For hole diameters smaller than 300 μm, a shortening of the laser pulse was observed, demonstrating the effect of plasma shutter. The pulse shortening, which depends on the hole diameter, corresponds to the reduction in the pulse energy passing through the hole. An analysis of the experimental data is based on hydrodynamic computations, and the physics of the process is illustrated by a simple analytical model.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1994

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References

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