Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1497753 | Optical Materials | 2006 | 6 Pages |
Abstract
Transient photoconductivity induced by UV (355Â nm) laser pulses in doped dielectric crystals CaF2:Sm2+, CaF2:Eu2+ and LSO:Ce3+ was studied by 8-mm microwave technique in a wide range of temperatures, from 300Â K down to 5Â K. It was possible to study the dynamics of free and bound photoexcited electrons. In LSO:Ce3+, the thermally-activated photoionization process at room temperature changes to a two-step photoionization at liquid helium temperature. In CaF2:Eu2+, two-step photoionization was detected at any temperature and electronic traps cause broadening of the photoconductivity signal at low temperature. In CaF2:Sm2+, the one-step photoionization process was confirmed at any temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
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Authors
M.-F. Joubert, S.A. Kazanskii, Y. Guyot, H. Loudyi, J.-C. Gâcon, C. Pédrini,