Comparison of Er-doped sol-gel glasses with various hosts

Qing Xiang; Yan Zhou; Yee Loy Lam; Boon Siew Ooi; Yuen Chuen Chan; Chan Hin Kam

doi:10.1117/12.370380

12 November 1999 Comparison of Er-doped sol-gel glasses with various hosts

Qing Xiang, Yan Zhou, Yee Loy Lam, Boon Siew Ooi, Yuen Chuen Chan, Chan Hin Kam

Proceedings Volume 3896, Design, Fabrication, and Characterization of Photonic Devices; (1999) https://doi.org/10.1117/12.370380
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

Using the sol-gel process, we prepared three groups of Er-doped glasses, namely, Er-doped Si0₂-A10_1.5 (SAB) glass, Er-doped Si0₂-Ti0₂-A10_1.5 (STAE) glass, and Er-doped Si0₂-Ge0₂-Al0_1.5 (SGAE) glass. Various erbium concentration and different host composition under the same processing condition have been studied in order to optimize the material composition to get the strongest fluorescence emission for each material system. It has been found that for SAE glass, the strongest fluorescence emission is obtained when the mole ratio of the three constituent oxides is lOOSiO₂ : 20A10_1.5 2ErO_1.5. For the STAE material system, the best composition ratio for the strongest fluorescence emission is 93 Si0₂ : 7TiO₂: 20A10_1.5 : lErO_1.5, whereas the value for SGAE glass is 9OSiO₂:lOGeO₂ : 2OAlO_1.5: 1ErO_1.5. But the relative lifetimes were obtained with the recipe lOOSiO₂:10A10_1.5:1ErO_1.5 for SAE series, 90 Si0₂:lOGeO₂:1OAlO_1.5: 1ErO_1.5 for STAE group and 93 Si0₂:7Ti0₂:20A10_1.5:1ErO_1.5 for STAE group. Using these recipes, three 20-layer (up to 2.5 μm) crack-free films have been deposited on silica-on-silicon (SOS) substrates with multiple spin-coating and rapid thermal annealing (RTA). Only the STAE film and the SGAE film are found to guide light. The experimental results show that STAB glasses have higher hydrophilicity than SGAE glasses and SGAE glasses has lower crystallization temperature than STAE glasses. The fact that these waveguiding films emit relatively strong fluorescence around the wavelength of 1.55 μm implies that such planar waveguides are potential candidates from which integrated optical waveguide amplifiers and lasers operating at the third optical fiber communication window can be fabricated.

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Qing Xiang, Yan Zhou, Yee Loy Lam, Boon Siew Ooi, Yuen Chuen Chan, and Chan Hin Kam "Comparison of Er-doped sol-gel glasses with various hosts", Proc. SPIE 3896, Design, Fabrication, and Characterization of Photonic Devices, (12 November 1999); https://doi.org/10.1117/12.370380

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KEYWORDS

Glasses

Luminescence

Erbium

Crystals

Refractive index

Sol-gels

Waveguides

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