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

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.