Opt Lett. 2013 Nov 15;38(22):4667-70. doi: 10.1364/OL.38.004667.
Resonant excited state absorption (ESA) and relaxation processes in Tb(3+)-doped aluminosilicate glasses are quantitatively evaluated. A model describing the excitation steps and upconversion emission is developed and applied to interpret the results from laser-induced surface deformation using thermal mirror spectroscopy. The fluorescence quantum efficiency of level (5)D(4) was found to be close to unity and concentration independent while, for the level (5)D(3), it decreases with Tb(3+) concentration. Emission spectroscopy measurements supported these results. ESA cross sections are found to be more than three orders of magnitude higher than the ground state absorption cross section.
定量评估了掺铽铝硅酸盐玻璃中的共振激发态吸收（ESA）和弛豫过程。开发了一个描述激发步骤和上转换发射的模型，并应用于解释热镜光谱法激光诱导表面变形的结果。发现能级（5）D（4）的荧光量子效率接近 1 且与浓度无关，而对于能级（5）D（3），则随 Tb（3+）浓度的增加而降低。发射光谱测量结果支持这些结果。ESA 截面比基态吸收截面高三个数量级以上。
