EUV properties of two diffraction gratings

摘要: We have obtained two mechanically ruled replica gratings from Hyperfine Inc. and one holographically ion-etched grating Ferranti Astron, Ltd. The gratings, made on spheroid cervit blank, are 86.3 x 12mm a groove density of 1710 grooves per mm with platinum overcoating. manufacturers were given identical specifications (size, reflective coating, etc.). Both blazed to reflect into the first inside order for wavelength ≈ 700 A. evaluated at extreme ultraviolet (EUV) calibration facility University California, Berkeley, Space Sciences Laboratory determine suitability adoption in an EUV spectrometer, primary instrument Remote Atmospheric Ionospheric Detection System (RAIDS) be flown aboard TIROS satellite 1991. efficiency was measured five wavelengths using pencil beam positions grating. Our measurements show that efficiencies higher than operating order. However, holographic other orders unexpectedly ones. displayed about magnitude less scattered light