The spectral widths, positions, and shifts of the sharp emission lines for the R 1 →X 5 and R 2 →Y 3 inter-Stark transitions within the respective intermanifold transitions of 4 F 3/2 → 4 I 9/2 and 4 F 3/2 → 4 I 11/2 of Nd 3ϩ ions in Ba 0.25 Mg 2.75 Y 2 Ge 3 O 12 laser host have been investigated as a function of temperature. The linewidths of these transitions increased as the temperature of the host crystal was increased. The emission line for the R 1 →X 5 transition shifted toward the shorter wavelength ͑blue shift͒, while the emission line for the R 2 →Y 3 transition shifted toward the longer wavelength ͑red shift͒ with increasing temperature. The experimental results of the temperature-dependent linewidths and line shifts of these transitions are explained in light of the existing theory of the phonon-ion interaction in crystalline solids.
A spectroscopic investigation is performed on Nd3+ ‐doped Ba0.25Mg2.75Y2Ge3O12 (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 Nd3+4F3/2 state to the 4IJ manifolds. The measured fluorescence lifetime of the 4F3/2 metastable state of Nd3+ is 303 μs. The radiative lifetime of this state is, however, obtained as 311 μs. The broader absorption near 800 nm, longer fluorescence lifetime of 303 μs, and the larger branching ratio of 44% for the 4F3/2 → 4I9/2 transition in Nd3+ : BAMGAR are significant improvements over Nd3+ : YAG as a 0.94 μm laser material.
The Stark components of the lower-lying manifolds of Nd 3ϩ in Ba 0.25 Mg 2.75 Y 2 Ge 3 O 12 have been characterized using the well-resolved emission spectra for the 4 F 3/2 → 4 I 9/2 and 4 F 3/2 → 4 I 11/2 transitions at 300 K. The emission cross sections of these intermanifold transitions as well as the inter-Stark transitions of R 1 →X 5 at 940.4 nm and of R 2 →Y 3 at 1061.8 nm have been determined. Finally, these results are compared with those of the standard laser host, Nd:YAG, and the potential of Nd:BAMGAR as a laser host is discussed.
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