Reflecting at 30.4 and Antireflecting at 58.4 nm

The Optical Constants of Sputtered U and a-Si at 30.4 and 58.4 nm

Introduction Optical constants are used to compute the response of a material to light. Previously published optical constants for uranium and a-Si over portions of the extreme ultraviolet (EUV) are questionable. The optical constants of a-Si from peerreviewed literature are not consistent with optical constants calculated from the atomic scattering factors of crystalline Si. The optical consta...

Antireflecting and polarizing transparent bilayer coating on absorbing substrates at oblique incidence.

Capped Mo/Si multilayers with improved performance at 30.4 nm for future solar missions.

Novel capping layer structures have been deposited on periodic Mo/Si multilayers to optimize reflectance at 30.4 nm. Design, deposition and characterization of such coatings are presented. Most of the structures proposed show improved performance with respect to standard Mo/Si multilayers and are stable over time. Reflectance at 121.6 nm and in the visible spectral range have been also tested t...

The Solar Radius in the EUV during the Cycle XXIII

Aims. To determine the solar transition region and coronal radius at EUV wavelengths and its time evolution during Solar Cycle XXIII. Methods. We use daily 30.4 and 17.1 nm images obtained by the Extreme Ultraviolet Imager (EIT) aboard the SoHO satellite and derive the solar radius by fitting a circle to the limb brightness ring. Results. The weighted mean of the temporal series gives (967′′.56...

High repetition rate operation of saturated tabletop soft x-ray lasers in transitions of neon-like ions near 30 nm.

We report average powers exceeding 1 microwatt in laser transitions of Ne-like ions at wavelengths near 30 nm. Gain-saturated operation was obtained at a repetition rate of 5 Hz exciting solid targets with pump pulses of ~1 J energy and 8 ps duration impinging at grazing incidence of 20 degrees. Gain-length products of about 20 were obtained in the 30.4 nm and 32.6 nm transitions of Ne-like V a...