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Proceedings Paper

Pulsed laser deposition of rare-earth-doped glasses: a step toward lightwave circuits
Author(s): R. Morea; J. Fernandez; R. Balda; J. Gonzalo
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Paper Abstract

Pulsed Laser Deposition (PLD) is used to produce Er-doped lead-niobium germanate (PbO–Nb2O5–GeO2) and fluorotellurite (TeO2–ZnO–ZnF2) thin film glasses. Films having high refractive index, low absorption and large transmission are obtained in a narrow processing window that depends on the actual PLD configuration (O2 pressure ∼a few Pa, Laser energy density ∼2-3 J cm-2 for the results presented in this work). However, Er-doped thin film glasses synthetized at room temperature using these experimental parameters show poor photoluminescence (PL) performance due to non-radiative decay channels, such as a large OH- concentration. Thermal annealing allows improving PL intensity and lifetime (τPL), the latter becoming close to that of the parent Er-doped bulk glass. In addition, the use of alternate PLD from host glass and rare-earth targets allows the synthesis of nanostructured thin film glasses with a controlled rare-earth concentration and in-depth distribution, as it is illustrated for Er-doped PbO–Nb2O5–GeO2 film glasses. In this case, PL intensity at 1.53 μm increases with the spacing between Er-doped layers to reach a maximum for a separation between Er-doped layers ≥ 5 nm, while τPL is close to the bulk value independently of the spacing. Finally, the comparison of these results with those obtained for films grown by standard PLD from Er-doped glass targets suggests that nanostructuration allows reducing rare-earth clustering and concentration quenching effects.

Paper Details

Date Published: 24 February 2016
PDF: 10 pages
Proc. SPIE 9744, Optical Components and Materials XIII, 974402 (24 February 2016); doi: 10.1117/12.2208859
Show Author Affiliations
R. Morea, Instituto de Óptica (Spain)
J. Fernandez, Univ. del País Vasco (Spain)
R. Balda, Univ. del País Vasco (Spain)
J. Gonzalo, Instituto de Óptica (Spain)

Published in SPIE Proceedings Vol. 9744:
Optical Components and Materials XIII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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