【摘要】 蓝光激光器在彩色激光显示、高密度光储存、海洋资源探测、水下通信以及生物科技等领域具有广泛的应用前景。目前较为成熟的Yb³⁺掺杂光纤激光器倍频后仅能获得～490 nm蓝绿光，因此如何得到接近450 nm的纯蓝光激光器是目前急需解决的问题。Nd³⁺:⁴F_3/2→⁴I_9/2能级跃迁产生的0.9μm光经倍频后可获得～450 nm光，并可应用于蓝光激光器，但该跃迁产生的光所占荧光分支比较低。本文系统研究了1%（质量分数）Nd₂O₃掺杂50GeO₂-（20-x）PbO-15BaO-15ZnO-xNb₂O₅（x%=0%,2.5%,5%,10%,15%,摩尔分数）玻璃的吸收光谱、荧光光谱和荧光寿命，计算了相应的Judd-Ofelt强度参数以及增益带宽。研究发现，Nb₂O₅的加入会使Nd³⁺在900 nm荧光峰的吸收截面、发射截面、有效线宽和荧光分支比增加。当Nb₂O₅浓度为10%（摩尔分数）时，Judd-Ofelt强度参数Ω₂=5.91×10^-20 cm²,光谱质量参数χ=1.01,荧光分支比为42.9%。综上所述，Nb₂O₅能提高Nd³⁺ 0.9μm的荧光分支比，从而倍频获得纯蓝光（450 nm）,有利于蓝光激光器的发展及应用。更多还原

【Abstract】 Blue laser has a wide range of application prospects in the fields of color laser display, high-density optical storage, exploration of marine resource, underwater communication and biomedical sciences, etc. However, the relatively mature Yb³⁺ doped fiber laser can only obtain blue green（～490 nm） laser after frequency doubling. Therefore, it is an urgent issue to obtain a pure blue laser close to 450 nm. The 0.9 μm fluorescence generated by the ⁴F_3/2→⁴I_9/2 level transition of Nd³⁺ can obtain the pure blue laser output of ～450 nm after frequency doubling, which has excellent application potential in the field of blue laser. However, the fluorescence generated by this transition occupies a low fluorescence branching raito. In this paper, the absorption spectrum, fluorescence spectrum and fluorescence lifetime of 1%（mass fraction） Nd₂O₃ doped 50 GeO₂-（20-x）PbO-15 BaO-15 ZnO-xNb₂O₅（x%=0%, 2.5%, 5%, 10%, 15%,mole fraction） glass were systematically studied, and the corresponding Judd-Ofelt intensity parameters and gain bandwidth were calculated. It is found that the 900 nm absorption cross section, emission cross section, effective linewidth and fluorescence branching ratio of Nd³⁺ increase with the doping of Nb₂O₅. When the concentration of Nb₂O₅ is 10%（mole fraction）, Judd-Ofelt intensity parameter Ω₂=5.91×10^-20 cm², the spectral quality parameter χ=1.01, and the fluorescence branching ratio is 42.9%. In summary, 0.9 μm fluorescence branching ratio of Nd³⁺ can be raised by Nb₂O₅, so as to obtain pure blue light（450 nm） by frequency doubling, which is beneficial to the development and application of blue laser.更多还原