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Split-aperture laser pulse compressor design tolerant to alignment and line-density differences

分離開口レーザーに対するパルス圧縮器のアライメントや線密度差に対するデザイン許容度

Rushford, M. C.*; Britten, J.*; Barty, C. P. J.*; 實野 孝久*; 近藤 公伯; 宮永 憲明*; 田中 和夫*; 兒玉 了祐*; Xu, G.*

Rushford, M. C.*; Britten, J.*; Barty, C. P. J.*; Jitsuno, Takahisa*; Kondo, Kiminori; Miyanaga, Noriaki*; Tanaka, Kazuo*; Kodama, Ryosuke*; Xu, G.*

チャープパルス増幅(CPA)レーザーの大型化により1パルスあたりに出力されるレーザーエネルギーの向上が著しい。近年の技術では最終段階のパルス圧縮器は回折格子対を用いる必要があり、そのダメージ閾値の要請から回折格子の大型化は避けられず、既に2枚の組合せによるパルス圧縮器がデザインされている。本論文では大阪大学で採用されたダイアモンド型圧縮機のアライメント精度や回折格子線密度の違いに対する許容度について議論している。

We introduce a four-pass laser pulse compressor design based on two grating apertures with two gratings per aperture that is tolerant to some alignment errors and, importantly, to grating-to-grating period variations. Each half-beam samples each grating in a diamond-shaped compressor that is symmetric about a central bisecting plane. For any given grating, the two half-beams impinge on opposite sides of its surface normal. It is shown that the two split beams have no pointing difference from paired gratings with different periods. Furthermore, no phase shift between half-beams is incurred as long as the planes containing a grating line and the surface normal for each grating of the pair are parallel. For grating pairs satisfying this condition, gratings surfaces need not be on the same plane, as changes in the gap between the two can compensate to bring the beams back in phase.

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パーセンタイル:58.78

分野:Optics

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