Spectroscopic analysis of Nd/Al co-doped silica glass fabricated by laser additive manufacturing

In this work, Nd/Al co-doped silica glass was prepared by laser additive manufacturing. The doping concen-trations of Nd3+ and Al3+ ions were measured to be 1.36 wt% and 1.71 wt%, respectively. A long fluorescence lifetime 664 mu s in silica glass was achieved. Based on the measured absorption spectrum, the Judd-Ofelt (J-O) parameters of Nd3+ ions in matrix were calculated by J-O theory, which are omega 2 = 7.57 x 10-20cm- 2, omega 4 = 8.01 x 10-20cm- 2, omega 6 = 3.17 x 10-20cm-2, respectively. The value of omega 4/omega 6 is 2.53, indicating that Nd/Al co-doped silica glass has good spectral quality. The results demonstrate that Nd/Al co-doped silica glass man-ufactured by the laser additive manufacturing possesses excellent optical properties, which can be used in high-energy laser and amplification devices and promote the development of Nd-doped fiber lasers in the future.