Generation of multi-terawatt vortex laser beams
  We report the fabrication of large-area phase masks on thin fused-silica substrates that are suitable for shaping multi-terawatt femtosecond laser beams. We apply these phase masks for the generation of intense femtosecond optical vortices. We further quantify distortions of the vortex beam patterns that result from several common types of mask defects. 
Craig Ament, Lee Johnson, Andreas Schmitt-Sody, Adrian Lucero, Thomas   Milster, Pavel Polynkin
physics.optics