12 December 1984 A Flat Field Spectrograph For Solar Xray Spectroscopy
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Variable line spaced gratings have been reported with high diffraction efficiencies at EUV and soft Xray wavelengths. Their availability makes it possible to consider new designs of spectroscopes. A solar spectrograph design is presented, which uses a holographic grating to correct system aberrations and produce a flat image field, perpendicular to the principal ray, over an extended wavelength range.
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Stanley Mrowka, "A Flat Field Spectrograph For Solar Xray Spectroscopy", Proc. SPIE 0503, Application, Theory, and Fabrication of Periodic Structures, DiffractionGratings, and Moire Phenomena II, (12 December 1984); doi: 10.1117/12.944817; https://doi.org/10.1117/12.944817

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