Influence of Yb3+ concentration on KYbxY1−x(WO4)2 laser crystals

Abstract

Abstract KYbxY1−xW(O4)2 (KYbxY1−xW, x = 0.05–0.20) crystals were successfully grown by the top seeded solution growth method (TSSG) with K2W2O7 as flux. The KYbxY1−xW crystals maintain monoclinic structure, and the crystal unit cell volume decreases as the Yb3+ ions doping concentration increases. The emission cross-sections σem in KYbxY1−xW(x = 0.05–0.20) crystals are 0.805 × 10-20 cm2, 0.599 × 10-20 cm2, 1.147 × 10-20 cm2 and 1.008 × 10-20 cm2 at 980 nm. A direct continuous-wave diode pumped KYb0.05Y0.95W laser crystal could generate an output power of 1.31 W with slope efficiency of 44.8% by using an output coupler with a transmission T = 1%.