Abstract
The unique disordered structure of the CaGdAlO4 crystal, combined with its exceptional thermal and spectral properties, has contributed to its growing popularity in the field of ultrafast lasers. In this work, high quality Yb3+ doped CaGdAlO4 crystals were directionally grown by the rapid and cost-effective micro-pulling down method for the first time. The anisotropic analysis determined [100]-orientation as the optimal growth direction due to its superior spectral, thermal and continuous-wave laser properties compared to that of [001]-orientation. Based on the optimized [100]-orientation, two novel crystals, Yb3+:CaGd1-xLuxAlO4 (x = 0.05 and 0.1), were designed by incorporating Lu3+ into Gd3+ site. Benefiting from the enhanced structure disorder induced by Lu3+ co-doping, the Yb3+:CaGd1-xLuxAlO4 crystals demonstrated superior spectral and pulsed laser performance compared to that of Yb3+:CaGdAlO4, featuring a broader emission spectrum, narrower pulse duration and higher peak power. The utilization of anisotropy and composition design strategies effectively enhanced the spectral and pulsed laser properties, providing a feasible way for the optimization of compact and high-performance laser devices.
Published Version
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