24 February 2016 Pulsed laser deposition of rare-earth-doped glasses: a step toward lightwave circuits
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Proceedings Volume 9744, Optical Components and Materials XIII; 974402 (2016) https://doi.org/10.1117/12.2208859
Event: SPIE OPTO, 2016, San Francisco, California, United States
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.
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R. Morea, J. Fernandez, R. Balda, J. Gonzalo, "Pulsed laser deposition of rare-earth-doped glasses: a step toward lightwave circuits", Proc. SPIE 9744, Optical Components and Materials XIII, 974402 (24 February 2016); doi: 10.1117/12.2208859; https://doi.org/10.1117/12.2208859
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