title: Fabrication and evaluation of a wideband multilayer laminar-type holographic grating for use with a soft-x-ray flat-field spectrograph in the region of 1.7 keV.
abstract: A multilayer laminar-type holographic grating having an average groove density of 2400 lines/mm is designed and fabricated for use with a soft-x-ray flat-field spectrograph covering the 0.70-0.75 nm 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. Mo/SiO2 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 8-14 eV for the emission spectra generated from electron-impact x-ray sources.
authors: Quantum Beam Science Directorate, Japan Atomic Energy Agency, Kyoto, Japan. imazono.takashi@jaea.go.jp
authors: Takashi
authors: T
authors: Imazono
authors: Masahiko
authors: M
authors: Ishino
authors: Masato
authors: M
authors: Koike
authors: Hiroyuki
authors: H
authors: Sasai
authors: Kazuo
authors: K
authors: Sano