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Proceedings Paper

Laser and optical properties of Yb:YAG ceramics with layered doping distribution: design, characterization and evaluation of different production processes
Author(s): Guido Toci; Antonio Lapucci; Marco Ciofini; Laura Esposito; Jan Hostaša; Leonida Antonio Gizzi; Luca Labate; Paolo Ferrara; Angela Pirri; Matteo Vannini
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Paper Abstract

The laser, optical and spectroscopic properties of multilayer Yb:YAG ceramic structures, differently activated, were investigated. The structures were designed by means of Finite Element Modeling, adjusting the doping distributions to reduce peak temperature, surface deformation and thermally induced stresses, depending on the pump and cooling geometry. Two ceramic processes were used, i.e. dry pressing of spray-dried powders (SD) and tape casting (TC), resulting in different defect density and size distribution: TC gives a more uniform transmission, whereas SD results in larger, unevenly scattered defects. The spectroscopic properties were found independent from the production process. The laser performance has been characterized under high intensity pumping in a longitudinally diode pumped laser cavity, comparing the behavior of the different structures in terms of slope efficiency, stability under increasing thermal load, spatial uniformity of laser emission. Slope efficiency values as high as 58% in Quasi-CW pumping conditions and 54% in CW conditions was measured in two-layers structures. The production process and the number of layers influenced the behavior of the samples, in particular regarding the spatial uniformity of the laser emission. Samples made by tape casting have shown overall a better thermal stability with respect to the samples made by spray drying.

Paper Details

Date Published: 16 March 2016
PDF: 13 pages
Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97261P (16 March 2016); doi: 10.1117/12.2211344
Show Author Affiliations
Guido Toci, Istituto Nazionale di Ottica (Italy)
Antonio Lapucci, Istituto Nazionale di Ottica (Italy)
Marco Ciofini, Istituto Nazionale di Ottica (Italy)
Laura Esposito, Istituto di Scienza e Tecnologia dei Materiali Ceramici (Italy)
Jan Hostaša, Istituto di Scienza e Tecnologia dei Materiali Ceramici (Italy)
Leonida Antonio Gizzi, Istituto Nazionale di Ottica (Italy)
Luca Labate, Istituto Nazionale di Ottica (Italy)
Paolo Ferrara, Istituto Nazionale di Ottica (Italy)
Angela Pirri, Istituto di Fisica Applicata Nello Carrara (Italy)
Matteo Vannini, Istituto Nazionale di Ottica (Italy)

Published in SPIE Proceedings Vol. 9726:
Solid State Lasers XXV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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