Journal article
Spectroscopy and dynamics of Cr 4 + : Y 3 Al 5 O 12
Physical review. B, Condensed matter, Vol.49(22), pp.15505-15513
06/1994
Handle:
https://hdl.handle.net/2376/122691
Abstract
We present a spectroscopic overview of Cr4+-doped Y3Al5O12 (YAG), a new laser material for the near-infrared region (NIR). It is found that only 2% of the Cr ions are tetrahedrally coordinated Cr4+. However, the optical spectra are dominated by this ion. The missing inversion symmetry for the tetrahedral site causes higher cross sections than are common for octahedrally coordinated ions. The experimental data include a survey of the absorption and emission features. Lifetime measurements, as well as piezospectroscopic experiments yield additional spectroscopic information. Our data suggest an energy-level assignment that is different from the one previously used to describe the spectrum. Instead of ascribing the strong NIR absorption band, centered at around 1000 nm, to the 3B1(3A2)→3E(3T2) transition, we assign it to the 3B1(3A2)→3A2(3T1) transition. This assignment is able to describe the polarization-dependent spectra, the piezospectroscopic results, and the results from earlier polarization-dependent saturation experiments. An analysis of the luminescence decay rate yields quantum efficiencies of around 49% at 10 K and 15% at room temperature, resulting in a peak emission cross section of 3.5×10−19 cm2.
Metrics
9 Record Views
Details
- Title
- Spectroscopy and dynamics of Cr 4 + : Y 3 Al 5 O 12
- Creators
- Hergen Eilers - University of GeorgiaUwe Hömmerich - University of GeorgiaStuart M. Jacobsen - University of GeorgiaWilliam M. Yen - University of GeorgiaK. R. Hoffman - Whitman CollegeW. Jia - University of Puerto Rico-Mayaguez
- Publication Details
- Physical review. B, Condensed matter, Vol.49(22), pp.15505-15513
- Academic Unit
- Institute for Shock Physics
- Identifiers
- 99900876938501842
- Language
- English
- Resource Type
- Journal article