SPECTROSCOPIC CHARACTERIZATION OF ND3+BAMGAR CRYSTAL

A spectroscopic investigation is performed on Nd3+-doped Ba0.25Mg2.75Y 2Ge3O12 (BAMGAR), a garnet structured germanate crystal host. The Judd -Ofelt analysis is applied to the measured room temperature absorption spectrum to determine the radiative decay rates and branching ratios of transitions from the Nd-3+ ?4F?(3/2 State to the I-4(J) manifolds. The measured fluorescence lifetime of the F-4(3/2) metastable state of Nd3+ is 303 mu s. The radiative lifetime of this stare is, however, o btained as 4aaale state of NdS 311 mu s. The broader absorption near 8 00 nm, longer fluorescence lifetime of 303 mu s, and the larper a bran ching ratio of 44% for the 4F(3/2) --> I-4(9/2) transition in Nd3+ BAM GAR aesignificant improvements over Nd3+: YAG as a 0.94 mu m laser mat erial.