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Focused beam control in super-ASHURA KrF laser system

Published online by Cambridge University Press:  01 October 1999

I. MATSUSHIMA ,
I. OKUDA ,
Y. MATSUMOTO ,
T. TOMIE ,
E. MIURA ,
H. YASHIRO ,
E. TAKAHASHI ,
S. KATO  and
Y. OWADANO
I. MATSUSHIMA
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
I. OKUDA
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
Y. MATSUMOTO
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
T. TOMIE
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
E. MIURA
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
H. YASHIRO
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
E. TAKAHASHI
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
S. KATO
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
Y. OWADANO
Affiliation:
Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 3058568, Japan
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Abstract

Beam smoothing techniques and focused beam profile control techniques for high efficiency KrF laser fusion are reported. We have developed 1D and 2D broadband random phase (BRP) irradiation techniques. Our next idea is the combination of a laser oscillator with a wide beam divergence angle and phase plates. The wide divergence angle laser beam eliminates the speckle patterns caused by the phase plates. Well characterized focal spot patterns have been observed with the front-end pulse of the Super-ASHURA KrF laser system. Amplification experiments are on going.

Type
Research Article
Information
Laser and Particle Beams , Volume 17 , Issue 4 , October 1999 , pp. 693 - 699
Copyright
1999 Cambridge University Press

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