Abstract
A multilayer laminar-type holographic grating having an average groove density of is designed and fabricated for use with a soft-x-ray flat-field spectrograph covering the region. A varied-line-spaced groove pattern is generated by the use of an aspheric wavefront recording system, and laminar-type grooves are formed by a reactive ion-etching method. multilayers optimized for the emission lines of Hf-M, Si-K, and W-M are deposited on one of the three designated areas on the grating surface in tandem. The measured first-order diffraction efficiencies at the respective centers of the areas are 18%–20%. The flat-field spectrograph equipped with the grating indicates a spectral linewidth of for the emission spectra generated from electron-impact x-ray sources.
© 2007 Optical Society of America
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