【摘要】 超短脉冲激光因在精密加工、生物医学等领域广泛的应用而备受关注，其发展高度依赖于具有宽带增益光谱的激光增益介质。相比激光玻璃，掺稀土离子的无序激光晶体兼具宽带增益光谱与优异的稳定性，是产生超短脉冲激光的理想增益介质。然而，混晶组分、晶体结构及其对发射带宽及中心配体对称性间的构效关系仍缺乏系统认知。本文对多个掺镱混晶体系，包括Yb∶Y₂（Ca,Mg）₃（SiO₄）₃、Yb∶Ca（Y,Gd）AlO₄（Yb∶CALYGO）及Yb∶（Gd,Y）AlO₃（Yb∶GYAP），开展了系统分析，揭示了混晶组分比例、结构无序度与Yb³⁺增益带宽之间的内在规律。在此理论指导下，成功生长了Yb∶CALYGO和Yb∶GYAP单晶，并分别实现了25和23 fs的超短脉冲激光输出。本研究为超快无序激光晶体的理性设计与其在超快激光应用中的性能优化提供了关键理论支撑和有效实现途径。更多还原

【Abstract】 Ultrashort lasers have attracted considerable attention due to their extensive applications in precision micromachining and biomedicine, and their development strongly relies on laser gain media with broad gain bandwidths. Compared with laser glass, rare-earth-ion-doped disordered crystals combine broad emission bandwidths with excellent thermal and mechanical stability, making them ideal candidates for generating ultrafast laser pulses. However, a systematic understanding of the mixed composition, crystal structure, and their structure-property relationships regarding emission bandwidth and central ligand symmetry remains lacking. In this work, several mixed crystal systems were systematically investigated, including Yb∶Y₂（Ca,Mg）₃（SiO₄）₃, Yb∶Ca（Y,Gd）AlO₄（Yb∶CALYGO） and Yb∶（Gd,Y）AlO₃（Yb∶GYAP）, and reveal the intrinsic correlations between the mixed composition, structural disorder, and the spectral gain bandwidth of Yb³⁺. Guided by these theories, Yb∶CALYGO and Yb∶GYAP single crystals were successfully grown, enabling the generation of ultrafast pulses with durations of 25 and 23 fs, respectively. This work provides a theoretical foundation and an effective approach for the rational design and performance optimization of disordered crystals for ultrafast laser applications.更多还原