[Calculation and analysis of optical transitions of Pr3+ ions in fluoride glass].

Intensity parameters of Pr~(3+) in ZBLAN glass were calculated using Judd-Ofelt(J-O) theory with absorption spectrum measurement.The anomalous behavior of Pr~(3+) was discussed using J-O theory.Base on the intensity parameters,the optical parameters such as spontaneous emission rate,branching ratio,and integrated emission cross section etc were predicted.The future of the glass as a laser material was discussed,and the probability of photon avalanche in the material was also analysed.