Abstract

A piano grating consisting of variably-spaced grooves concentric about a common point (fig. 1) provides λ/Δλ ~ 3000 over a simultaneous factor two in soft x-ray wavelength (λ = 10-100 Å). The complete instrument contains a 1 arc sec 1-meter diameter collecting mirror whose 10 meter focal length includes a 1.5 meter spectrometer with an imaging detector having 15 μm pixels. The end-to-end efficiency is approximately 4%, and the grating has a factor 4 variation in line spacing across a 50 cm ruled width.

© 1984 Optical Society of America