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Tb3+掺杂SrO-TiO2-SiO2玻璃在800nm的飞秒激光照射下可以观察到红外至可见的上转换现象。由飞秒激光激发的上转换荧光光谱与267nm氙灯激发的荧光光谱非常相似。其上转换荧光可归因于Tb3+的5D3→7F4和5D4→7FJ(J =6 ,5 ,4 ,3)能级跃迁。由发光强度和泵浦光源能量之间的关系可以得出此上转换过程为三光子同时吸收过程。基态电子同时吸收三个红外光子被激发到较高激发态,然后以非辐射跃迁方式弛豫到较低激发态,再辐射跃迁到基态从而产生Tb3+的特征发光峰。这现象可应用于三维立体显示,可见激光和高密度光存储技术。
Tb3 + -doped SrO-TiO2-SiO2 glass can observe the infrared to visible up-conversion phenomenon under the 800nm femtosecond laser irradiation. The upconversion fluorescence spectrum excited by femtosecond laser is very similar to the fluorescence spectrum excited by 267nm xenon lamp. The upconversion fluorescence can be attributed to the 5D3 → 7F4 and 5D4 → 7FJ (J = 6, 5, 4, 3) energy transitions of Tb3 +. From the relationship between the luminescence intensity and the energy of the pump light source, it can be concluded that the up-conversion process is a three-photon simultaneous absorption process. The ground state electrons simultaneously absorb three infrared photons excited to a higher excited state, and then relax to a lower excited state in a non-radiative transition mode, and then radiate to a ground state to generate a characteristic luminescence peak of Tb3 +. This phenomenon can be applied to three-dimensional display, visible laser and high-density optical storage technology.