Optical excitation and relaxation in active color centers

Giuseppe Baldacchini

doi:10.1117/12.293440

1 November 1997 Optical excitation and relaxation in active color centers

Giuseppe Baldacchini

Proceedings Volume 3176, Tunable Solid State Lasers; (1997) https://doi.org/10.1117/12.293440
Event: Tunable Solid State Lasers, 1996, Wroclaw, Poland

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 F_A 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 F_A(I) and F_A(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.

Citation Download Citation

Giuseppe Baldacchini "Optical excitation and relaxation in active color centers", Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); https://doi.org/10.1117/12.293440

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