Abstract
Abstract Holographic gratings recorded with aspheric wave fronts have been designed by means of the analytic design method so as to have the interchangeability with mechanically ruled varied-line-space (VLS) gratings that were designed for soft X-ray flat-field spectrographs. It is shown that aspheric wave-front recording optics makes it possible to produce large variations in the grating constant (e.g., more than 30% over a ruled area of 50 mm) required for flat-field spectrographs. The imaging properties of the holographic gratings thus designed are discussed from the viewpoint of interchangeability with mechanically ruled VLS gratings.
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