TRANSITION METAL DOPED SPINEL TYPE MGAL SB 2 /SB O SB 4 /SB PHOSPHOR, LASER APPARATUS INCLUDING THE SAME AND PROCESS FOR PRODUCING THE PHOSPHOR

摘要

A transition metal doped spinel type MgAl2O4 fluorescent material capable of laser oscillation and a laser apparatus using the same. It is made from a mixed raw material of an Al raw material and a Mg raw material added thereto in an amount together with a transition metal raw material so that the amount of Mg exceeds that of Al by a few percents in terms of molar ratio, by shaping the mixed raw material under pressure to form a source material rod, and single-crystallizing the source material rod in a selected gaseous atmosphere by floating zone melting. The doping amount of Ti is such that in composition formula MgAl2-x TixO4 it lies in a range: 0.003 ≦ x ≦ 0.01. The doping amount of Mn is such that in composition formula Mg1-xMnxAlO4 it lies in a range: 0.003≦ x≦ 0.01.