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The first-order astigmatism-free conditions in crossed Czerny-Turner (C-T) spectrometer are derived. To our best knowledge, there is no report about this kind of research. For the requirements of the optical parameters of the relative aperture of 8 and the working wavelength ranging from 780nm to 1020nm, according to the derived formula, the astigmatism-free crossed C-T spectrometer is built up with...
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