Abstract
Transition metal ions with the d1 or d9 electronic configuration, such as Ti3+, V4+ and Cu2+, are of particular interest for tunable solid state lasers. In these ions, the existence of basically only one high-lying excited state determines the absence of internal transitions that could produce excited state absorption. Ti3+ in corundum is an example of a successful system. V4+ in the same host looks also very promising.1
© 1987 Optical Society of America
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