Structure and spectrum of the novel laser crystal Yb: KY(WO₄)₂

The selection of the flux and the design of the proper process are the key factors for the growth of Yb:KY(WO₄)₂ laser crystal. Yb: KY(WO₄)₂ crystal is grown by top seeded solvent growth (TSSG) method using K₂W₂O₇ as a suitable flux. On the basis of TG-DTA, which has two obvious absorption peaks at 1045 °C and 1010°C., the Yb:KY(WO₄)₂ crystal's melting point is 1045°C, phase transition point from tetragonal system to monoclinic system is at 1040°C. Analyzing the X-ray diffraction spectrum of Yb:KY(WO₄)₂ crystal powder sample, we can conclude that the β-Yb:KY(WO₄)₂ crystal is of monoclinic system, and C2/c space group. The Yb:KY(WO₄)₂ crystals structure forms from the WO₆ octahedra joined by WOOW double oxygen bridges and WOW single bridges. The IR and Raman spectra showed, the atom group WO₆ has flex vibrations at 93lcm^-1, 925cm^-1, 891cm^-1 and 840cm^-1, and bend vibrations at 395cm^-1, 369cm^-1, 346cm^-1 and 312cm^-1, the WOOW double oxygen bridge has vibrations at 901cm^-1, 759cm^-1, 686cm^-1, 435cm^-1, 496cm^-1 and 298cm^-1, and the WOW single bridges has vibrations at 809cm^-1, 525cm^-1 and 235cm^-1. At room temperature, the absorption peaks are at 940nm and 980nm the emission peaks are at 989nm-1030nm.