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Two-dimensional beam smoothing technique for KrF laser systems

  • Isao Matsushima (a1), Hidehiko Yashiro (a1), Toshihisa Tomie (a1), Isao Okuda (a1), Yuji Matsumoto (a1), Eisuke Miura (a1), Eiichi Takahashi (a1) and Yoshiro Owadano (a1)...

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.

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Two-dimensional beam smoothing technique for KrF laser systems

  • Isao Matsushima (a1), Hidehiko Yashiro (a1), Toshihisa Tomie (a1), Isao Okuda (a1), Yuji Matsumoto (a1), Eisuke Miura (a1), Eiichi Takahashi (a1) and Yoshiro Owadano (a1)...

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