Crystalline Structure of Potassium Holmium Double Tungstate

Realization of on-chip lasers in crystalline double tungstate waveguides using focused-ion-beam nanostructuring

We report our recent work on obtaining on-chip lasers in crystalline double tungstate waveguides using focused-ion-beam (FIB) nanostructuring. Photonic cavity structures were defined by forming deeply etched Bragg gratings in KGdxLu1-x(WO4)2:Yb 3+ using FIB milling. The FIB milling procedure was optimized and gratings more than 4 μm in depth with an improved total sidewall angle of about 5 wer...

Raman studies of A2MWO6 tungstate double perovskites.

The Raman spectra of seven A(2)MWO(6) tungstate double perovskites are analysed. Ba(2)MgWO(6) is a cubic double perovskite with Fm3[combining macron]m symmetry and its Raman spectrum contain three modes that can be assigned in a straightforward manner. A fourth mode, the asymmetric stretch of the [WO(6)](6-) octahedron, is too weak to be observed. The symmetry of Ba(2)CaWO(6) is lowered to tetr...

Channel Waveguide Lasers and Amplifiers in Single-Crystalline Ytterbium-Doped Potassium Double Tungstates

Crystal structure of lead tungstate at 1.4 and 300 K

The crystal structure of lead tungstate, PbWO4, is tetragonal, scheelite type, space group I41/a. This compound is frequently subjected to lead deficiency, due to the difference in the vapour pressure of the two oxides, WO3 and PbO, used in the crystal growth. One group has reported that lead vacancies can order in a crystal structure derived from the scheelite type, but of lower symmetry and d...

Kinetics of a first-order crystalline-amorphous transformation in zirconium tungstate

Xiaozhi Yan,1,2,* Xiangting Ren,2 Guangai Sun,1 Dong Li,3 Xin Li,1,3 Duanwei He,3,† and Wenge Yang2,4 1Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China 2Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China 3Institute of Atomic and Molecular Physics, Sic...