Fourier transform absorption spectroscopy with a resolution as fine as 0.02 cm−1 was applied to Er3+-doped monoclinic BaY2F8 laser crystals in a wide wave number range (500–24 000 cm−1) and in the temperature range 9–300 K. The careful analysis of the complex narrow line spectra induced by Er3+ allowed us to determine with high accuracy the crystal field splitting of the fundamental 4I15∕2 and of the excited 4I13∕2, 4I11∕2, 4I9∕2, 4F9∕2, 4S3∕2, 2H11∕2, 4F7∕2, 4F5∕2, and 4F3∕2 manifolds. On the basis of the experimental data, the crystal-field parameters were determined and Newman’s superposition model was applied: in this way a slight displacement of Er3+ with respect to the Y3+ position was foreseen. The Judd-Ofelt parameters were evaluated: the lifetime values deduced from them were compared to the experimental ones and discussed. The effects caused by increasing Er3+ concentrations (0.5%, 2%, 12%, and 20% atomic fraction) were studied in detail. The new lines, the line broadening, and the line-shape changes were explained in terms of Er3+-Er3+ interaction.
|Autori:||A. BARALDI; R. CAPELLETTI; M. MAZZERA; A. PONZONI; G. AMORETTI; N. MAGNANI; A. TONCELLI; TONELLI M|
|Titolo:||Role of Er3+ concentration on high resolution spectra of BaY2F8 single crystals|
|Anno del prodotto:||2005|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.72.075132|
|Appare nelle tipologie:||1.1 Articolo in rivista|