The Si sub 1-x N sub x Rugate
Abstract
With the advent of lasers, intense sources of monochromatic light are now available. The problem of eye and sensor protection from these devices is now crucial to the field operations of troops and military weapons systems. In other words it is necessary to construct a filter which will reject particular laser lines from impinging upon a material. The present article presents results in the infrared and near infrared region of the spectrum. The effectiveness of a Rugate filter constructed of a silicon-nitrogen alloy is calculated. Single and double line rugates are discussed. The dependence on the rugate on the various parameters such as the number of cycles, the amplitudes of the sine waves and the phase angle are presented. The effects of absorption, constructional malfunctions, and the angle of incidence of the laser beam are studied. It is found that quite large optical densities can be achieved with rather thin films, thus the silicon-nitrogen rugate is a viable candidate for a laser rejection filter. Keywords: Silicon nitrides; Ion beam assisted deposition and laser rejection filters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 08, 1989
- Accession Number
- ADA211236
Entities
People
- R. H. Bassel
Organizations
- United States Naval Research Laboratory