Gerald Burns, F.H. Dacol
Solid State Communications
The results of a study of the sharp-line fluorescence of Cr3+ in a number of crystals is presented. The host crystals were several diamagnetic garnets, a spinel, and emerald. The results are used to discuss two aspects of the sharp-line energy levels. First, some of the dynamical aspects are considered. The measurements of the temperature dependence of the sharp no-phonon R-line positions, linewidths, and efficiencies are in reasonable agreement with the existing theory. The theory assumes a simple form for the interaction of the Cr3+ energy levels with the phonons and uses a Debye density of states. The phonon-assisted radiation is also discussed. Second, some of the static aspects of the energy levels are considered. The splittings between the no-phonon R lines along with splittings of the ground states of the Cr3+ in the same crystals are compared with the predictions of existing theories. Here the agreement is very poor. The experimental data show the difference between the Cr3+ energy levels, when odd terms in addition to usual even crystal-field terms exist. The data also indicate some large nonlinearities between the energy-level splittings and the crystal field. © 1965 The American Physical Society.
Gerald Burns, F.H. Dacol
Solid State Communications
Marshall I. Nathan, William P. Dumke, et al.
Applied Physics Letters
Gerald Burns
Physical Review
Gerald Burns, G.V. Chandrashekhar, et al.
Solid State Communications