Showing papers on "Erbium published in 1976"

Stimulated emission from laser-pumped ytterbium- and erbium-activated glasses

Abstract: A calculation is reported of the energy parameters of stimulated emission of λ = 1.54 μ. radiation from glasses activated with Yb3+ and Er3+ ions and pumped with neodymium laser radiation. The calculation allows for the influence of the induced absorption at the pump wavelength and for the quenching of the excited levels of the Yb3+ and Er3+ ions. The kinetics and magnitude of the induced absorption are investigated for glasses of various compositions containing Yb3+ and Er3+. The calculated values of the energy parameters are compared with the experimental results. Some features of the stimulated emission spectra of erbium-activated phosphate glasses are considered.

Crystalline electric fields in dilute alloys: Y-Er

Abstract: From magnetization measurements M(T, theta )H on erbium doped yttrium single crystals the crystalline electric field parameters and the energy levels of the erbium groundstate 4I15/2 have been determined. The experimental results can be explained if the influence of the conduction electrons on the crystalline electric field is considered. Using a modified orthogonalized-plane-wave technique the contribution from the conduction electrons due to their 4f character has been calculated and the degree of 5d admixture has been determined from the experimental crystal field parameters A20(r2).