Ti~（3＋）离子掺杂浓度与Ti：Al_2O_3晶体的光谱畸变

通过室温下掺杂浓度为０．０３～０．４５Ｗｔ－％范围的Ｔｉ：Ａｌ２Ｏ３晶体的偏振激发光谱，荧光光谱和吸收光谱的测量，从实验上确信，Ｔｉ３＋在Ａｌ２Ｏ３基质晶体中不易形成Ｔｉ３＋离子对。并且发现，随着Ｔｉ３＋离子掺杂浓度的提高，偏振激发光谱发生了（ｌ）肩／峰强度比增加和（２）长波展宽现象，而相应波段的吸收光谱却未发现这种浓度效应导致的线型畸变。

Concentration dependent spectral distortion of Ti: A1_2O_3 crystals

Concentration-dependent polarzed excitation,fluorescence and absorption spectra of Ti:Al2o3 crystals were measured at room temperature with the Ti3+ ion doped levels from 0.03 wt-% to 0.45 wt-%. Line shape distortion in polarized excitation spectra, indicated as the increasing of the intensity ratio of the shoulder to Peak and spectral broadering at longer wavelength side,were found as the Ti3+ ion concentration increased, whereas such phenomena did not emerge in the polarized absorption spectra at the same band.It is experimentally convinced that no Ti3+ ion pairs were formed even for the highestly doped sample in our experiment.