Isolated Attosecond Pulse Generation in the Relativistic λ~3 Regime by Reflection/Deflection/Compression

摘要

Lasers that provide a focal energy encompassed by a volume of a few cubic wavelengths ( λ~3) can produce relativistic intensity with maximal gradients, using minimal energy. With particle-in-cell simulations we found, that single 200 attosecond pulses could be efficiently generated in a λ~3 laser pulse reflection, via deflection and compression from the relativistic plasma mirror driven by the pulse itself. An analytical model of coherent radiation from a charged layer confirms the pulse compression and is in good agreement with simulations. This novel technique is efficient (～10%) and can produce single attosecond pulses from the millijoule to the joule level.