In a laser-powered plasma accelerator, an ultrashort laser pulse is focused into a helium jet that is a couple of millimeters long.

 
  • 在雷射電漿加速器里,一個(gè)超短的雷射脈沖聚焦到一束大約兩、三公厘長(cháng)的氦噴射氣流中。
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