Single-shot microscopic electron imaging of intense femtosecond laser-produced plasmas

Inoue, Shunsuke; Tokita, Shigeki; Nishoji, Toshihiko; Masuno, Shinichiro; Otani, Kazuto; Hashida, Masaki; Sakabe, Shuji
December 2010
Review of Scientific Instruments;Dec2010, Vol. 81 Issue 12, p123302
Academic Journal
A simple technique for single-shot microscopic electron imaging was demonstrated for the study of intense femtosecond laser-produced plasmas. Passed through a permanent magnet lens designed for 110-keV electrons, hot electrons emitted from the plasma produced by a single laser pulse of 0.8 mJ with intensity of 3 × 1016 W/cm2 were successfully imaged. Analyzing this image, we found that electrons were emitted from an area of 3 μm in diameter. At higher laser intensity of 1018 W/cm2, distinct structures were observed in and near the focal spot of the laser; that is, the electrons were emitted from several separate spots. These results show that laser-plasma electron imaging is promising for studying the interactions of femtosecond lasers with high-density plasmas.


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