[1] Judd B R. Optical absorption intensities inrare-earth ions.Phys Rev,1962,127(3): 750~761
[2] Ofelt G S. Intensities of crystal spectra of rare-earth ions.J Chem Phys,1962,37(3):511~520
[3] Luciana Reyes pires Kassab,Lilia Coronato Courrol,et al. Spectroscopic properties of lead flouroborate glasses codoped with Er3+ and Yb3+.J Opt Soc Am B,2002,19(12):2921~2926
[6] Gan Fuxi.Optical Glass.Beijing:Science Press of China,1982.178~179(in Chinese)
[7] Krupke W F. Radiative transition probab- ilityies within the 4f3 ground configurationof Nd∶YAG.IEEE J Quant Elect,1971,QE-7(4):153
[8] Weber M J. Probabilities for radiative andnonradiative decay of Er3+ in LaF3.Phys Rev,1967,157(2):262~272
[9] Cranall W T.Spectral intensities of the trivalent lanthanides and actinidesinsolution ,I.Pr3+, Nd3+ ,Er3+,Tm3+ and Yb3+.J Chem Phys,1965,42(11): 3797~3806
[10] Zou X,Izumintani T.Spectroscopic proper-ties and mechanisms of excited state absorption and energy transfer upconversionfor Er3+-doped glasses.J Non-Cryst Solids,1993,162(5):68~80