6.<i>x</i> nm領域における希土類プラズマ極端紫外光源

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タイトル別名
  • Rare-earth Plasma Beyond Extreme Ultraviolet (BEUV) Sources at 6.<i>x</i> nm
  • 6.x nm領域における希土類プラズマ極端紫外光源
  • 6.x nm リョウイキ ニ オケル キドルイ プラズマ キョクタン シガイ コウゲン

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We have studied self-absorption effects of a laser-produced plasma (LPP) source at 6.xnm as a function of laser pulse duration and viewing angle. The spectral profiles are shown to have a strong dependence on viewing angle. Absorption effects are less pronounced when a 150-ps pulse duration is used due to reduced opacity resulting from plasma expansion. Conversion efficiencies and ion energies are also measured as a function of laser pulse duration and laser power density. A maximum conversion efficiency of 0.4% within a 0.6% bandwidth was measured, and lower ion kinetic energy was observed. It is concluded that in order to reduce self-absorption effects and ion yields, and increase conversion efficiencies, a short pulse duration should be used.

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