Imaging diagnostics of debris from laser-produced tin plasma with droplet target for EUV light source

Daisuke Nakamura, Tomoya Akiyama, Akihiko Takahashi, Tatsuo Okada

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2 Citations (Scopus)


The dynamics of debris from laser-produced tin (Sn) plasma was investigated for a practical ex-treme ultraviolet (EUV) lithography source. The kinetic behaviors of the Sn atoms and of the dense particles from Sn droplet target irradiated by double pulses from the Nd:YAG laser and the CO2 la-ser were also investigated by the laser-induced fluorescence imaging method and a high-speed im-aging, respectively. After the pre-pulse irradiation of the Nd:YAG laser, the Sn atoms were ejected in all direction from the target with a speed of as fast as 20 km/s and the dense particle cloud ex-panded by a reaction force due to the plasma expansion with a speed of approximately 500 m/s. The expanding target was subsequently irradiated by the main-pulse of CO2 laser and the dense cloud was almost disappeared by main-pulse irradiation.

Original languageEnglish
Pages (from-to)196-200
Number of pages5
JournalJournal of Laser Micro Nanoengineering
Issue number3
Publication statusPublished - Dec 1 2007


All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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