THE INTERACTION OF CHROMIUM IONS IN RUBY CRYSTALS
Physical sciences research papers no. 299
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
Pagination or Media Count:
Absorption, excitation, continuous fluorescence, and pulse fluorescence measurements were made on ruby samples with 0.94 and 2.1 Cr3 in the temperature range from 4.2K up to 700K. The widths, positions, intensities, and lifetimes of the R and N fluorescence lines were determined at numerous temperatures. The results for the temperature dependence of the linewidths are explained in terms of microscopic strains, Raman scattering of phonons by the impurity ions, and direct phonon processes. The results for the lineshifts with temperature are due to the absorption and emission of virtual phonons. The observed lifetimes of the R and N lines coincide in the temperature range where the systems are thermalized and the observed decays are pure exponentials. At temperatures where the systems are decoupled, an initial rise in fluorescence is observed at the N lines. The subsequent decay has the lifetime of the R lines for a 0.94 sample and the lifetime of the N lines for a 2.1 sample. These results are also explained in terms of energy transfer from single ions to pairs. The effects of reabsorption on the fluorescence spectrum are also discussed.
- Lasers and Masers
- Quantum Theory and Relativity