Experimen D1P4 l = +1 M = 3.3 .avi Boris Knyazev Oleg Kameshkov Nikolay Vinokurov Valery Cherkassky Yulia Choporova Vladimir Pavelyev 10.6084/m9.figshare.5936860.v1 https://opticapublishing.figshare.com/articles/media/Experimen_D1P4_l_1_M_3_3_avi/5936860 This is a videofilm for the diffraction of Bessel vortex beam on amplitude grating with round holes (hole diameter is 1 mm, period is 4 mm):diffraction patterns vs. distance wavelength is 130 um (experiment at Novosubirsk Free Electron Laser Facility). 2018-05-18 15:44:51 Optical vortices Talbot and self-imaging effects Terahertz imaging Free-electron lasers (FELs)