Abstract
Many experiments performed with grazing incidence monochromators require the reduction of the harmonic content of the output photon beam. Two systems are proposed to alleviate this problem: 1) one system based on variable angle, multilayer diffraction elements and 2) another system using several pairs of fixed critical angle mirrors each covering a restricted energy range. Experimental data and calculations using tabulated optical constants are used to determine the transmission and harmonic rejection of several of these filter systems. A system employing fixed critical angle mirrors is simplest mechanically with good transmission and harmonic rejection and seems to be the most attractive approach.
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