Interaction of intense femtosecond laser pulses with high-Z solids

摘要

A plasma irradiated by an intense very short pulse laser can be an ultimate high brightness source of incoherent inner-shell X-ray emission of 1-30keV. The recently developed 100 TW, 30 fs laser facility in JAERI can make considerable enhancement here. To show this a hybrid model combining hydrodynamics and collisonal particle-in-cell simulations is applied. Effect of laser prepulse on the interaction of an intense s-polarized femtosecond, approx 20/40 fs, laser pulse with high-Z solid targets is studied. A new absorption mechanism originating from the interaction of the laser pulse with plasma waves excited by the relativistic component of the Lorentz force is found to increase the absorption rate over 30