High-energy electrons generation in laser procuced plasmas

Emission of high-energy electron beams up to 2 MeV were observed from underdense plasmas produced by focusing high-power short laser pulses (1.8TW, 100fs) on gas jets. The electron beam was collimated in a half angle of 3–4° around the optical axis of the laser beam. The energy of the electrons has the power-law spectrum of E^−3.5. The production of the high-energy electrons closely correlated with the appearance of the complex filamentary structure of the laser propagation.