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Two-dimensional beam smoothing technique for KrF laser systems

Published online by Cambridge University Press:  09 March 2009

Isao Matsushima ,
Hidehiko Yashiro ,
Toshihisa Tomie ,
Isao Okuda ,
Yuji Matsumoto ,
Eisuke Miura ,
Eiichi Takahashi  and
Yoshiro Owadano
Isao Matsushima
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Hidehiko Yashiro
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Toshihisa Tomie
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Isao Okuda
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Yuji Matsumoto
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Eisuke Miura
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Eiichi Takahashi
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
Yoshiro Owadano
Affiliation:
Electrotechnical Laboratory, 1–1-4, Umezono, Tsukuba, 305, Japan
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Abstract

Broad-band random-phase (BRP) irradiation is one of the beam smoothing techniques for KrF laser drivers. We have introduced this technique into the KrF laser system ASHURA. By one-dimensional (ID) BRP smoothing, the speckle pattern in conventional random-phase irradiation has been removed. Two BRP beams were overlap-focused on the target incoherently. Although the obtained profile is rather smooth, some low-frequency nonuniformity remains. To improve the uniformity, a new technique for two-dimensional (2D) smoothing has been proposed. In this technique, a wedged etalon is used to get angular dispersion to the orthogonal direction to the ID BRP effect. The preliminary experiment has been carried out.

Type
Research Article
Information
Laser and Particle Beams , Volume 14 , Issue 1 , March 1996 , pp. 101 - 105
Copyright
Copyright © Cambridge University Press 1996

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References

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