Some electronic transitions of neodymium in the Ca(2-x)Nd(x)Al(2+x)Si2
(1-x)O(7) laser material have been investigated using high resolution
spectroscopy. The non Gaussian profiles of the absorption and fluoresc
ence lines have been analyzed. From the study it has been deduced the
existence of energy transfers between the Nd ions inside the matrix. A
partial order of the structure makes gehlenite a material intermediat
e between a crystal and a glass and a good candidate for a diode pumpe
d tunable laser.