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Proceedings Paper

Optical excitation and relaxation in active color centers
Author(s): Giuseppe Baldacchini
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Paper Abstract

Color centers in alkali halide crystals possess a peculiar optical cycle, which delivers an emission very often with quantum efficiency near 1, a few of them having the qualities required by active media. Among these the FA center was the first one to lase, and it is the most stable, efficient and easy to be produced. However up to now, as far as its basic properties are concerned, it remains a rather elusive point defect.Indeed recent results brought up again for discussion the old classification between FA(I) and FA(II) centers, the last ones only being optical active centers. It has ben found that both species can coexist in the same host crystal, their relative number being a function of temperature. This phenomenon opens up new perspectives for studying in detail relaxation, thermal excitation, and energy transfer processes at a microscopic level after optical excitation.

Paper Details

Date Published: 1 November 1997
PDF: 13 pages
Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); doi: 10.1117/12.293440
Show Author Affiliations
Giuseppe Baldacchini, Centro Richerche di Frascati/ENEA (Italy)

Published in SPIE Proceedings Vol. 3176:
Tunable Solid State Lasers
Wieslaw Strek; Edward Lukowiak; Barbara Nissen-Sobocinska, Editor(s)

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