40 research outputs found
Ultrahigh temporal contrast performance of the PHELIX petawatt facility
We report on the temporal contrast performance of the PHELIX facility in view of the requirements imposed by solid-target interaction experiments. The requirement analysis for the nanosecond and picosecond temporal contrast is derived from empirical data and simple theoretical modeling, while the realization shows that using an ultrafast optical parametric amplifier and plasma mirrors enables meeting this specification.</jats:p
Licht für schwere Ionen : Petawatt High Energy Laser for Heavy Ion Experiments (PHELIX) am GSI Helmholtz-Zentrum Darmstadt
How the laser beam size conditions the temporal contrast in pulse stretchers of chirped-pulse amplification lasers
A study on the effects and visibility of low-order aberrations on laser beams with orbital angular momentum
Laguerre-Gaussian-like laser beams have been proposed for driving experiments with high-intensity lasers. They carry orbital angular momentum and exhibit a ring-shaped intensity distribution in the far field which make them particularly attractive for various applications. We show experimentally and numerically that this donut-like shape is extremely sensitive to off-axis wavefront deformations. To support our claim, we generate a Laguerre-Gaussian-like laser beam and apply a selection of common low-order wavefront aberrations. We investigate the visibility of those wavefront deformations in the far field. Under use of established tolerance criteria, we determine the thresholds for the applied aberration and compare the findings with simulations for verification