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Springer eBooks

The Effect of Spectral Diffusion on the Saturation Transient Regime

R. Boscaino, F. M. Gelardi, Rosario N. Mantegna

Published Jan 1, 1985• 0 citations
Publisher
DOI
10.1007/978-94-009-5351-2_10

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The free induction decay (FID) after saturation by a laser radiation pulse of finite duration is studied for systems with spectral diffusion. The exact solutions of the FID signal shape have been obtained in the framework of telegraph noise model as well as model of noncorrelated spectral exchange. These solutions take into account the finite duration of saturating field and are valid at arbitrary value of the spectral exchange rate and the amplitude of the coherent field. A selfconsistent explanation of the field dependence of the FID rate found by Szabo and Muramoto is obtained under the slow noncorrelated spectral diffusion.
We report what is, to the best of our knowledge, the first observation of transient spectral hole burning in erbium-doped fluorozirconate glass around 1.53 μm. Holes deeper than 12% were burnt. A study of the hole width as a function of power density, wavelength, temperature, and erbium concentration has been performed and underlines the role of spectral diffusion. Dynamics of refilling of the holes, involving optical pumping of the long-lived 4I13/2 excited state, was also investigated. The nearly linear temperature dependence of the hole width behaves as reported for other rare-earth ions and is interpreted within the framework of the two-level systems theory. Hole-refilling dynamics has been studied for three different erbium concentrations and is used to interpret the origin of the saturation.