Grazing-incidence reflectivity of Si-Au coatings for optics with high thermal load

Luca Poletto; Giampiero Naletto; Giuseppe Tondello; Alessandro Patelli; Valentino Rigato; Guido Salmaso; Davide Silvestrini; Juan I. Larruquert; Jose Antonio Mendez

doi:10.1117/12.522983

4 February 2004 Grazing-incidence reflectivity of Si-Au coatings for optics with high thermal load

Luca Poletto, Giampiero Naletto, Giuseppe Tondello, Alessandro Patelli, Valentino Rigato, Guido Salmaso, Davide Silvestrini, Juan I. Larruquert, Jose Antonio Mendez

Author Affiliations +

Proceedings Volume 5171, Telescopes and Instrumentation for Solar Astrophysics; (2004) https://doi.org/10.1117/12.522983
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Measurements of the EUV, visible and near-infrared grazing-incidence reflectivity of Si-Au coatings are presented. Such coatings could be used for EUV optical components subjected to very high thermal load, as the optics for the EUV spectrometer of the Solar Orbiter mission. The mission consists in putting an orbiting spacecraft in close proximity (45 solar radii) to the Sun, then in a severe thermal environment (34 kW/m²). The thermal stresses are reduced if the optics looking at the disk are operated in grazing incidence. The common materials used as a grazing-incidence coatings with high EUV reflectivity have low reflectivity in the visible and near-infrared, on the contrary materials with high visible grazing-incidence reflectivity have poor EUV reflectivity. A suitable coating with high reflectivity both in the EUV and visible is a silicon layer (100-400 Å) deposited on gold. The silicon has high EUV grazing-incidence reflectivity and is partially transparent in the visible and near-infrared, where the gold coating has high reflectivity. Measurements on Si-Au samples show both higher EUV reflectivity than gold samples and higher visible reflectivity than silicon samples.

Citation Download Citation

Luca Poletto, Giampiero Naletto, Giuseppe Tondello, Alessandro Patelli, Valentino Rigato, Guido Salmaso, Davide Silvestrini, Juan I. Larruquert, and Jose Antonio Mendez "Grazing-incidence reflectivity of Si-Au coatings for optics with high thermal load", Proc. SPIE 5171, Telescopes and Instrumentation for Solar Astrophysics, (4 February 2004); https://doi.org/10.1117/12.522983

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE