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1. WO2020072402 - REFLECTIVE OPTICAL ELEMENT

Publication Number WO/2020/072402
Publication Date 09.04.2020
International Application No. PCT/US2019/053934
International Filing Date 01.10.2019
IPC
G02B 5/08 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
08Mirrors
CPC
G02B 5/0808
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
08Mirrors
0808having a single reflecting layer
G02B 5/0858
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
08Mirrors
0816Multilayer mirrors, i.e. having two or more reflecting layers
085at least one of the reflecting layers comprising metal
0858the reflecting layers comprising a single metallic layer with one or more dielectric layers
G02B 5/0875
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
08Mirrors
0816Multilayer mirrors, i.e. having two or more reflecting layers
085at least one of the reflecting layers comprising metal
0875the reflecting layers comprising two or more metallic layers
Applicants
  • CORNING INCORPORATED [US]/[US]
Inventors
  • MYRICK, Bruce Hildreth
  • WAMBOLDT, Leonard Gerard
  • WOODARD, Kenneth Smith
Agents
  • BRAY, Kevin L.
Priority Data
62/740,61803.10.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) REFLECTIVE OPTICAL ELEMENT
(FR) ÉLÉMENT OPTIQUE RÉFLÉCHISSANT
Abstract
(EN)
A suppport for optical elements is described. The support includes a base substrate with high specific stiffness and a finishing layer. The base substrate is a non-oxide ceramic material, preferably a carbide, such as boron carbide or silicon carbide. The finishing layer is preferably Ge or an alloy of Al and Si. The finishing layer is or is capable of being processed to provide a surface with low finish. Low finish is achieved by diamond turning or polishing the finishing material. The finishing layer has a coefficient of thermal expansion similar to the coefficient of thermal expansion of the base substrate. The optical element optionally includes a reflective stack on the finishing layer.
(FR)
L'invention concerne un support destiné à des éléments optiques. Le support comprend un substrat de base présentant une rigidité spécifique élevée et une couche de finition. Le substrat de base est un matériau céramique non oxyde, de préférence un carbure, tel que le carbure de bore ou le carbure de silicium. La couche de finition est de préférence du Ge ou un alliage d'Al et de Si, et est traitée ou peut être traitée de façon à produire une surface à faible finition. Une finition faible est obtenue par tournage ou polissage au diamant du matériau de finition. La couche de finition présente un coefficient de dilatation thermique similaire au coefficient de dilatation thermique du substrat de base. L'élément optique comprend éventuellement un empilement réfléchissant sur la couche de finition.
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