300 / 2019-02-22 09:04:26

Tender X-ray beam splitting with high efficiency by use of multilayer grating based on conical diffraction

Multilayer Grating,Laminar,Tender X-Ray,Free Electron Lasers (FELs),Beam Splitting

全体主题 > Science and Technology based on XFEL

Conical diffraction of a gratingdiffers from the classical type of diffractionbecause the incident and diffracted wave vectors arenot orthogonal to the direction of the grooves, and thelight is almost parallel to the grooves.Compared with a grating in the classical type of diffraction, relativelyhigher diffraction efficiencies will be observed in conical diffraction.And, when the incident beam is perfectly parallel to the grooves of a rectangulargrating profile (laminar grating), the symmetry of the setup causes diffraction of the intensitysymmetrically around the plane of incidence.A multilayer grating is a grating which is coated with multilayers and can inhence the energy transport efficiency, especially for the tender X-ray range (1-8 keV)that covers a large number of K- and L-edges of medium-Z elements,and M-edges of high-Z elements.A multilayer laminar grating used in the symmetry of conical diffraction can obtain higher efficiency and has the feasibility of the amplitude beam splitting in the tender X-ray range. In this work, using numerical simulation, a possibility of multilayer lanimar grating used in the symmetry of conical diffraction for beam splitting in 4.5 keV (Ti Kα1) has been demonstrated, showing a high efficiency and good flexibility of design.