Higher-order suppression in an on-blaze plane-grating monochromator

Abstract

The transmittance of an on-blaze plane-grating monochromator has been calculated as a function of wavelength for different spectral orders. The calculations show that higher, undesirable orders can be suppressed by a judicious selection of grating blaze angle and coating material. However, for intense sources, such as a storage ring operating at high power and current, higher-order suppression due to blaze angle and coating material may have to be augmented by using transmitting filters or spectrally selective detectors or both.