We present theoretical and experimental results on enhancement of temporal intensity profile of PW laser pulses. Techniques of peak power increasing based on self-phase modulation, second harmonic generation and cascaded quadratic nonlinearity effects will be discussed. The specific of its implementation for modern powerful laser facilities is investigated and results will be demonstrated.
Vortex light with orbital angular momentum (OAM) have successfully been
generated in many laboratories. So far, however, energies of the particles with
OAM, called twisted photons or electrons, remain below 0.1 keV. Here we report
on the first high energy vortex photon beam obtained via Compton scattering of
the topologically charged (OAM=2) 2.3eV laser photons on the PETRA 6 GeV