Sprite‐a high power E‐beam pumped KrF laser

This paper describes a high power KrF laser pumped by multiple electron beams. Laser triggered switching is used to synchronize the beams to a few ns. Up to 10 kJ in a 60 ns pulse is switched out from four pulse forming lines using less than 20 mJ of KrF radiation. An unstable resonator is used with a four pass injection scheme which results in ≳200 J output at 249 nm in a low divergence beam.