Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Low Loss Mirror Coatings Using Absorbing Materials

IP.com Disclosure Number: IPCOM000076949D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Spiller, E: AUTHOR

Abstract

Described are mirrors that have reflectivity in the wavelength region between 50 and 500 angstroms. The basic concept is to replace the standard multilayer stack by a stack which contains absorbing mirrors. The design principle is to position the absorber in the nodes of the standing wave within the coating. Some examples of absorber materials are gold and magnesium for wavelengths of 300 angstroms and samarium and lithium for wavelengths of 70 angstroms.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Low Loss Mirror Coatings Using Absorbing Materials

Described are mirrors that have reflectivity in the wavelength region between 50 and 500 angstroms. The basic concept is to replace the standard multilayer stack by a stack which contains absorbing mirrors. The design principle is to position the absorber in the nodes of the standing wave within the coating. Some examples of absorber materials are gold and magnesium for wavelengths of 300 angstroms and samarium and lithium for wavelengths of 70 angstroms.

High reflectivities can be obtained if very thin absorbing layers and structures with many periods are used. Both even and odd numbers are layers that can be employed. The reflectivity for an odd number of layers is slightly higher than the average between the value for the next two adjacent even numbers. A further increase in reflectivity is possible if structures are used which are not completely periodic.

1