【摘要】 飞秒激光在军事、医学、通讯、加工等领域有着重要应用,已经成为新世纪激光技术领域的研究热点。得益于激光二极管（LD）的快速发展,以LD作为泵浦源成为新型全固态飞秒激光器的发展趋势。Yb³⁺离子掺杂的激光晶体材料因其独特的能级结构、宽带吸收与发射等优势,逐渐成为LD直接泵浦并实现1.0μm飞秒激光输出的重要增益介质。详细总结了当前掺Yb³⁺飞秒激光晶体的研究进展,分析了目前存在的主要问题,给出了未来飞秒激光晶体发展的两个建议方向:高效率小功率飞秒激光和大功率高能量飞秒激光。以Yb³⁺:Sr₃Y₂（BO₃）₄晶体为例,详细研究了其晶体生长、光谱、连续与飞秒激光性能,并实现了中心波长在1 060 nm处脉宽为116 fs,平均输出功率为1.08 W,光光转换效率为33.1%的高效率飞秒激光输出,表明Yb³⁺:Sr₃Y₂（BO₃）₄及其同体系晶体是一类优异的高效率飞秒激光材料。更多还原

【Abstract】 As widely used in military, medicine, communication, processing and other fields, femtosecond laser has become a research hotspot of the whole laser technology in the 21st century. The pump source used by laser diodes（LDS） has become a new development trend of all-solid-state femtosecond lasers owe to the rapid development of LDs. Yb³⁺-doped laser crystal materials gradually become important gain media for LD pumping and generate 1.0 μm femtosecond laser due to their unique energy level structures, broad absorption and emission spectra. In this paper, the research progress of Yb³⁺-doped femtosecond laser crystals is summarized in detail, the main problems are analyzed,and two directions for the development of femtosecond laser crystals in the future are proposed: high efficiency and low power femtosecond laser, high power and high energy femtosecond laser. The crystal growth, spectra properties,continuous and femtosecond laser performances of the Yb³⁺:Sr₃Y₂（BO₃）₄ crystal were studied in detail. And the Yb³⁺:Sr₃Y₂（BO₃）₄ femtosecond laser with the center wavelength of 1060 nm, pulse width of 116 fs, average output power of 1.08 W and optical conversion efficiency of 33.1% were successfully generated. The experimental results indicate that Yb³⁺:Sr₃Y₂（BO₃）₄ and its corresponding system crystals are excellent femtosecond laser materials with high optical conversion efficiency.更多还原