Optical Materials Study Program
Abstract
Various materials are being investigated for use as diffraction limited mirror substrates. Included are dielectrics, such as fused silica, low expansion glasses and glass ceramics, and beryllium (Be) based materials. Material and processing specifications for Be optical components are developed and recommended. Sectioned Be mirrors were brazed and diffusion bonded and successfully polished and tested. Low reflectivity and very low scatter are reported for an anodized optically polished bare Be surface. Results of test programs of Precision Surface Interferometer are presented and discussed. Most dielectrics are temporally and thermally stable to approximately the limit of detectability. Hydrostatically prepared Be is more stable than the commercial counterparts and the reattritioning process has provided further improvement. The role of residual stress in thermal and temporal instabilities is presented. Data from Linear Dimensional Interferometer and Vacuum Dilatometer are presented. Details of brazing and diffusion bonding experiments for Be are included.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0865842
Entities
People
- Roger A. Paquin
- William R. Goggin