Aa. Andrade et al., TIME-RESOLVED STUDY OF THERMAL AND ELECTRONIC NONLINEARITIES IN ND+3 DOPED FLUORIDE GLASSES, Electronics Letters, 34(1), 1998, pp. 117-119
Using a time resolved Z-scan technique, the authors distinguished elec
tronic (population lens) and thermal nonlinearites. The first measurem
ents of the polarisability difference Delta alpha between excited (F-4
(3/2)) and ground (I-4(9/2)) states of Nd+3 ions in fluoride glasses a
re presented. A value of Delta alpha similar or equal to 1.6 x 10(-26)
cm(3) was obtained in fluorindate glass and Delta alpha < 0.2 x 10(-2
6) cm(3) was estimated for ZBLAN.