Development of bismuth doped lead-aluminum-zinc-germanate glass as a broadband optical gain medium

M. Hughes; T. Suzuki; Y. Ohishi

doi:10.1117/12.806763

6 February 2009 Development of bismuth doped lead-aluminum-zinc-germanate glass as a broadband optical gain medium

M. Hughes, T. Suzuki, Y. Ohishi

Proceedings Volume 7212, Optical Components and Materials VI; 721203 (2009) https://doi.org/10.1117/12.806763
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

In this paper we present the development process of a glass based on bismuth and aluminum co-doped germanate (GAB) glass. Other workers have demonstrated broadband optical gain in GAB glass. We found the addition of PbO to this glass (GAPB glass) increased the quantum efficiency (QE). Excitation of GAPB glass at 808 nm produced emission peaking at 1230 nm with a width of 260 nm, indicating the glass may be useful as a broadband optical amplifier covering the second telecoms window. The composition of each component of the GAPB glass was optimized for the QE and lifetime of this emission to produce an optimized composition of 87.4GeO₂-6Al₂O₃-6PbO-0.6Bi₂O₃ (% molar) which had a QE of 67%. However, this composition contained many white inclusions which x-ray diffraction measurements indicated were a phase separation. This would make the glass unsuitable for fibre fabrication. We tried a variety of melting condition which did not improve the glass, the melting conditions did however affect the QE and lifetime. The optimum melting conditions were 1250°C for 30 min in a N₂ atmosphere. Next we tried adding various quantities of a variety of glass additives including SiO₂, LiO, ZnO and SrCO₃. All these additives reduced the QE, and all except SiO2 produced a transparent glass in the appropriate quantity. The quantity of these additives which gave a transparent glass and their QE's were LiO: 10% and 6%, ZnO: 10% and 43%, SrCO₃: 5% and 27% respectively. Therefore the optimized composition for QE and transparency is 74.4GeO₂-10ZnO-6Al₂O₃-6PbO-0.6Bi₂O₃.

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M. Hughes, T. Suzuki, and Y. Ohishi "Development of bismuth doped lead-aluminum-zinc-germanate glass as a broadband optical gain medium", Proc. SPIE 7212, Optical Components and Materials VI, 721203 (6 February 2009); https://doi.org/10.1117/12.806763

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KEYWORDS

Glasses

Quantum efficiency

Bismuth

Absorption

Silica

Zinc oxide

Transparency

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