CORRELATION BETWEEN RADIATIVE TRANSITION-PROBABILITIES OF ND3-GLASSES( AND COMPOSITION IN SILICATE, BORATE, AND PHOSPHATE)

Compositional dependence of spontaneous emission probabilities between initial F-4(3/2) and terminal I-4(J) (J = 9/2, 11/2, 13/2, 15/2) leve ls of Nd'' were studied for about 90 samples of silicate, borate, and phosphate glasses using the Judd-Ofelt theory. The effect of the coval ency of the Nd-O bond on the magnitude of intensity parameters was est imated from the variation of spectral profiles of the I-4(9.2) --> G-4 (5/2), 2G7/2 and F-4(7/2), S-4(3/2) transitions. Intensity parameters OMEGA4 and OEMGA6 and the spontaneous emission probabilities were stro ngly affected by the ionic packing ratio of the glass host. The result s were discussed in terms of the site selectivity of Nd3+ ions in glas ses.