Spectroscopic analysis of the Er3+ (4f11) absorption intensities in NaBi(WO4)2
2004; American Institute of Physics; Volume: 95; Issue: 3 Linguagem: Inglês
10.1063/1.1637139
ISSN1520-8850
AutoresDhiraj K. Sardar, Charles C. Russell, Raylon M. Yow, John B. Gruber, Bahram Zandi, Edvard Kokanyan,
Tópico(s)Glass properties and applications
ResumoA spectroscopic analysis is performed on Er3+ (4f11) ions doped in NaBi(WO4)2 (NBWO) in order to assess this material for its potential as a near-infrared laser. The Judd–Ofelt model is applied to the room-temperature absorption intensities of Er3+ (4f11) in NBWO to obtain the three phenomenological intensity parameters: Ω2=5.50×10−20 cm2, Ω4=1.00×10−20 cm2, and Ω6=0.71×10−20 cm2. The intensity parameters are then used to determine the radiative decay rates (emission probabilities), radiative lifetimes, and branching ratios for the Er3+ transitions from the excited state multiplet manifolds to the lower lying manifold states. Using the radiative decay rates for the Er3+ (4f11) transitions between the corresponding excited states and the lower lying states, the radiative lifetimes of eight excited states of Er3+ are determined in this host. Using the measured room temperature fluorescence lifetime of approximately 4.75 ms and the radiative lifetime of 5.63 ms as predicted by the Judd–Ofelt model for the I13/24→I15/24 (1.52 μm) transition of Er3+ in NBWO the quantum efficiency is determined to be approximately 84% for this laser material.
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