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Near-normal-incidence extreme-ultraviolet efficiency of a flat crystalline anisotropically etched blazed grating

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Abstract

We have measured the extreme-ultraviolet (EUV) efficiency at an angle of incidence of 10° of a flat crystalline anisotropically etched blazed grating. The measured efficiencies are high for uncoated gratings and agree well with a calculated model derived from a reasonable estimate of the groove profile. The highest groove efficiencies derived from the measurements are 48.8% at 19.07nm and 64.1% at 16.53nm for the 2 and 3 orders, respectively, which are comparable to the best values obtained yet from a holographic ion-etched blazed grating. This presents opportunities to instrument designs for high-resolution EUV spectroscopy in astrophysics where high efficiency in high orders is desirable.

© 2006 Optical Society of America

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