A design review concludes that VPHGs are the current choice for WST's integral-field spectrograph, binary gratings are more promising for the high-resolution spectrograph, and both remain possible for the low-resolution spectrograph.
Volume Phase Ho lographic Gratings: Polarization Properties and Diffraction Efficiency,
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WST, the Wide-field Spectroscopic Telescope: dispersing elements
A design review concludes that VPHGs are the current choice for WST's integral-field spectrograph, binary gratings are more promising for the high-resolution spectrograph, and both remain possible for the low-resolution spectrograph.