Scattered-light properties of diffraction gratings.

摘要: One of the many calibrations performed for a scientific-quality spectrometer is characterization its scattered-light properties. The scattered light can arise from any optical surface, and leaks or scattering baffles also contribute to instrumental stray-light level. For diffraction-grating primary contribution has been found be grating. results measuring properties 10 diffraction gratings are discussed along with application these in analyzing total measured three spectrometers. It measurements that there two components grating light: Lorentzian-type component constant background component. Lorentzian predicted theory grating, consistent Rayleigh microscopic surface im erfections. was discovered multiple replicas same master exhibit significantly more than preceding replica by factors 1.1-2.