| Autor: |
Demirkhanyan, Gagik G., Demirkhanyan, Hasmik G., Kokanyan, Edvard P., Kostanyan, Radik B., Gruber, John B., Nash, Kelly L., Sardar, Dhiraj K. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Mar2009, Vol. 105 Issue 6, p063106-063106-7, 7p, 1 Diagram, 1 Chart, 3 Graphs |
| Abstrakt: |
We report results from a modeling study of temperature-dependent line broadening and associated Debye–Waller factors (DWFs) for zero-phonon transitions between the 2FJ (J=7/2,5/2) manifolds of Yb3+ in NaBi(WO4)2. The Hamiltonian includes the electron-phonon interaction between the electronic states of the Yb3+ (4f13) ions and the lattice (Debye) phonon spectrum of the host crystal in a second quantization formulation. The temperature dependences of the linewidths, DWFs, and the intensities of the transitions are reported in terms of the ratio of temperature to Debye temperature (T/TD). Of particular interest is the temperature dependence of the most intense transitions at emission wavelengths of 996.6 and 1010.2 nm. These transitions are the best candidates for low-threshold stimulated emission based on measured emission cross sections and lifetimes. We find that with a decrease in temperature, an abrupt increase in radiation intensity occurs for the 1010.2 nm emission transition, suggesting that an optimum temperature value for a maximum stimulated emission may be obtained for Yb3+ in this disordered structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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