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Miniaturization of step mirrors in a static Fourier transform spectrometer: theory and simulation

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Abstract

The diffraction at mirror facets restricts the size of step mirrors for static step-mirror-based Fourier transform spectrometers. This paper discusses the miniaturization of these step mirrors and proposes a quasiperiodic approximation of Fresnel diffraction to analyze the diffraction effect. Noise caused by diffraction is classified into approximation noise and edge noise. The edge-enlarge method is developed to reduce edge noise. This method can reduce mirror facet width to less than 30 times the longest wavelength to be studied. Simulation results are given.

© 2010 Optical Society of America

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