Active laser media based on fianite crystals

The spectral and lasing parameters of Yb³⁺ ions in zirconium dioxide crystals with a stabilised cubic structure (fianites) are studied. It is found that the absorption and luminescence spectra of Yb³⁺ in these crystals are characterised by a considerable inhomogeneous broadening. The nature of this broadening is investigated and the model of optical centres consistent with the properties of the inhomogeneous spectra of Yb³⁺ in the cubic zirconium dioxide crystal is proposed. It is shown that fianites can be used in solid-state lasers. Lasing in Yb³⁺ ions in diode-pumped fianite crystals was obtained and studied.