A N Chabushkin

Two-micron lasing on diode-pumped Y2O3 : Tm ceramics

The results of investigation of the spectral, luminescent and lasing properties of Tm : Y2O3 ceramics are presented. Lasing in Y2O3 ceramics is obtained at wavelengths of 1.95 and 2.05 μm. The maximum output laser power at these wavelengths was 2.4 and 0.3 W, respectively.

Spectroscopy of optical centers of Eu3+ ions in partially stabilized and stabilized zirconium crystals

The structure of the optical centers of Eu3+ ions in tetragonal (ZrO2)1–x–y(Y2O3)x(Eu2O3)y (х = 2.7–3.6; y = 0.1) and cubic (ZrO2)1–x–y(Y2O3)x(Eu2O3)y (х = 8–38; y = 0.1–0.5) crystals of solid solutions on the basis of zirconium dioxide is studied using the methods of optical and Raman-scattering spectroscopy. Characteristic optical centers of Eu3+ ions with different crystalline environments are revealed in the above compounds.

Structure, phase composition, and spectral-luminescent properties of ZrO2-Y2O3-Er2O3 crystals

This paper presents the results of investigations of the structure, phase composition, and spectral-luminescent properties of Er2O3-doped zirconia crystals with different Y2O3 concentrations: 99.7 mol % ZrO2-0.3 mol % Er2O3, 97.2 mol % ZrO2-1.0 mol % Y2O3-1.8 mol % Er2O3, 97.2 mol % ZrO2-2.0 mol % Y2O3-0.8 mol % Er2O3, 97.2 mol % ZrO2-2.5 mol % Y2O3-0.3 mol % Er2O3, 96.3 mol % ZrO2-3.4 mol % Y2O3-0.3 mol % Er2O3, and 86 mol % ZrO2-13.4 mol % Y2O3-0.6 mol % Er2O3. The transmission electron microscopy investigation has revealed the presence of twins in the 99.7 mol % ZrO2-0.3 mol % Er2O3 crystals with a monoclinic structure and in the 97.2 mol % ZrO2-2.5 mol % Y2O3-0.3 mol % Er2O3 and 96.3 mol % ZrO2-3.4 mol % Y2O3-0.3 mol % Er2O3 crystals with a tetragonal structure. No twins have been found in the 86 mol % ZrO2-13.4 mol % Y2O3-0.6 mol % Er2O3 crystals with a cubic structure. The phase composition of these crystals has been investigated using X-ray diffraction. It has been found that the 97.2 mol % ZrO2-1.0 mol % Y2O3-1.8 mol % Er2O3 crystals contain only the transformable tetragonal phase t, whereas the 97.2 mol % ZrO2-2.0 mol % Y2O3-0.8 mol % Er2O3, 97.2 mol % ZrO2-2.5 mol % Y2O3-0.3 mol % Er2O3, and 96.3 mol % ZrO2-3.4 mol % Y2O3-0.3 mol % Er2O3 crystals include two tetragonal phases with different degrees of tetragonality c/a: the transformable phase t and nontransformable phase t′. Specific features of the formation of Er3+ optical centers in zirconia crystals with different concentrations of stabilizing oxides have been revealed using the results of experiments on optical spectroscopy.

Phase composition and spectral-luminescent properties of yttrium partially stabilized zirconia crystals doped with Nd 2 O 3 and CeO 2

The phase composition and spectral-luminescent characteristics of yttrium partially stabilized zirconia (YSZ) crystals doped with Nd2O3 and CeO2 (ZrO2-Y2O3-Nd2O3-CeO2) are studied. X-ray diffraction shows that YSZ ZrO2-2.5 mol %Y2O3-0.2 mol %CeO2-0.1 mol %Nd2O3, ZrO2-2.03 mol %Y2O3-0.435 mol %CeO2-0.334 mol %Nd2O3, and ZrO2-2.03 mol %Y2O3-0.653 mol %CeO2-0.111 mol %Nd2O2 YSZ crystals contain two different tetragonal phases (transformable t and nontransformable ’t). The spectral-luminescent properties of these crystals indicate that Nd3+ ions occupy sites mainly in the transformable (t) phase.

Problems of High-quality Doped Y2O3-ceramics Fabrication

Tm:Y2O3, Ho:Y2O3 and Yb:Y2O3 ceramic samples were fabricated using different heat treatments modes. La2O3 (0.5 mol.%) and ZrO2 (1.5 mol.%) were used as sintering additives. Based on the investigation of structural properties of obtained samples, annealing mode was adjusted, and another set of samples with better optical quality was fabricated. In-line transmittance of the latter samples is 70% at 400nm and 75.6% at 600nm.

Lasing on the 4I13/2 → 4I15/2 transition of Er3+ ions in ZrO2 – Y2O3 – Er2O3 crystals under resonant diode pumping into the 4I13/2 level

Experimental results on lasing in ZrO2 – Y2O3 – Er2O3 crystals are presented. Under diode pumping of ZrO2 – Y2O3 (13.8 mol %) – Er2O3 (0.2 mol %) crystals into the 4I13/2 level of Er3+ ions, lasing is obtained at the 4I13/2 → 4I15/2 transition with a wavelength of 1648 nm.

Spectroscopic studies of a tetragonal–monoclinic phase transition in ZrO2–Y2O3–CeO2–Nd2O3 crystals

The character of the distribution of cerium and neodymium dopants in 95.14 wt % ZrO2–3.67 wt % Y2O3–0.89 wt % CeO2–0.30 wt % Nd2O3 crystals has been studied. It has been shown that the crystal has defect regions due to the violation of normal growth of the crystal, which are depleted in the stabilizing Y2O3 oxide and enriched in Nd2O3 and CeO2 dopants. The existence of inclusions of a monoclinic phase in defect regions has been revealed using Raman and optical spectroscopy. A tetragonal–monoclinic phase transition initiated in the crystal by annealing in air has been investigated.