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We describe the use of a simple spherical aluminum‐coated mirror to image the radiation of a distant XUV‐emitting plasma in the slit of a vacuum spectrograph. Calculations to determine the optimum position and curvature radius of the mirror as a function of the divergence of the emitted plasma radiation are described. Efficient light collection by the grazing incidence mirror allows calibration of an intensified diode array used as a detector with a low‐pressure (10−4 Torr) dc capillary discharge that does not require a complex differential pumping system.

Light collection and wavelength calibration for an extreme ultraviolet diode array spectrograph