Nonradiative energy transfer from the impurity ion into the host lattice for Cr{sup 4+}-doped forsterite laser crystal
- Department of Physics, The City College and Graduate Center of the City University of New York, New York, New York 10031 (United States)
- Institute for Ultrafast Spectroscopy and Lasers, New York State Center for Advanced Technology for Ultrafast Photonic Materials and Applications, Department of Physics, The City College and Graduate School of the City University of New York, New York, New York 10031 (United States)
A theoretical model explaining the nonradiative energy transfer from a photoexcited impurity ion into the lattice in a laser crystal is presented. The energy-transfer mechanism consists of electronic energy transfer to local vibrations that then dissipate their energy to lattice (phonon) modes of the same energy creating a nonequilibrium phonon population. The model explains the experimental temporal profiles of nonequilibrium optical phonons probed by time-resolved Raman scattering in Cr-doped forsterite laser crystal. The electronic transition time and relaxation lifetimes for phonon and for local modes are {approximately}3, 4, and 8 ps, respectively. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 550532
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 22; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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