VAPOR PHASE GROWTH OF RUBY MONOCRYSTALS.
Abstract
The vapor phase growth technique was further developed for the growth of large, high purity, low strain ruby monocrystals for laser applications. Constant growth temperature and reactant gas flow rate control units were incorporated into the crystal growth system. Other modifications were made in the growth system which permitted longer continuous runs than had been previously achieved. Ruby crystals were grown up to a weight of 96.3 grams in 58 hours. Some of the variables affecting the formation rate of chromium chloride were investigated. Some causes of gas inclusion-type defects were isolated and crystals were grown defect-free. Vapor-grown substrates were prepared from large crystals. A cylindrical ruby rod was fabricated without annealing from the 96.3-gram crystal. A threshold energy of 24.9 joules input was measured. Twyman-Green interferometry showed one fringe in the vapor-grown rod. Electronbeam microprobe analysis over the cross-section of the 96.3 gram crystal showed a chromium concentration deviation of plus or minus 8.77% or plus or minus 5 ppm. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1966
- Accession Number
- AD0629154
Entities
People
- Philip S. Schaffer