Persistent spectral hole-burning in a Eu3+-doped aluminosilicate glass from 8 to 295 K: Study of the burning and refilling kinetics, and of optical dephasing
Laboratoire d'Optique Quantique, École Polytechnique, 91128 Palaiseau, France
Published online: 15 April 2000
High-temperature persistent spectral hole-burning (PSHB), up to room temperature, has been observed in a -doped aluminosilicate glass using a high peak-power nanosecond dye laser. Spontaneous refilling as well as thermal cycling measurements show that at least two mechanisms, a fast and a slow one, are involved in our sample. We suggest that the fast or "easy"component may correspond to a non-photochemical local rearrangement of the host or to photoreduction of the ions and that the second one leading to very stable photoproducts may correspond to transfer of an electron over a sizable distance through a several-step process. The mechanisms we suggest agree with light-induced hole refilling measurements. Line broadening mechanisms are discussed and the temperature-dependent part of the homogeneous width and of the spectral shift is interpreted in terms of a two-phonon (Raman) process involving pseudo-local phonons.
PACS: 32.70.Jz – Line shapes, widths, and shifts / 63.20.Mt – Phonon-defect interactions / 78.30.Ly – Disordered solids
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000