Knyazev, Boris Kameshkov, Oleg Vinokurov, Nikolay Cherkassky, Valery Choporova, Yulia Pavelyev, Vladimir Experimen D1P4 l = +1 M = 3.3 .avi 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). Optical vortices;Talbot and self-imaging effects;Terahertz imaging;Free-electron lasers (FELs) 2018-05-18
    https://opticapublishing.figshare.com/articles/media/Experimen_D1P4_l_1_M_3_3_avi/5936860
10.6084/m9.figshare.5936860.v1