Faraday rotation and photoluminescence in heavily Tb(3+)-doped GeO2-B2O3-Al2O3-Ga2O3 glasses for fiber-integrated magneto-optics

Scientific Reports
Guojun GaoLothar Wondraczek

Abstract

We report on the magneto-optical (MO) properties of heavily Tb(3+)-doped GeO2-B2O3-Al2O3-Ga2O3 glasses towards fiber-integrated paramagnetic MO devices. For a Tb(3+) ion concentration of up to 9.7 × 10(21) cm(-3), the reported glass exhibits an absolute negative Faraday rotation of ~120 rad/T/m at 632.8 nm. The optimum spectral ratio between Verdet constant and light transmittance over the spectral window of 400-1500 nm is found for a Tb(3+) concentration of ~6.5 × 10(21) cm(-3). For this glass, the crystallization stability, expressed as the difference between glass transition temperature and onset temperature of melt crystallization exceeds 100 K, which is a prerequisite for fiber drawing. In addition, a high activation energy of crystallization is achieved at this composition. Optical absorption occurs in the NUV and blue spectral region, accompanied by Tb(3+) photoluminescence. In the heavily doped materials, a UV/blue-to-green photo-conversion gain of ~43% is achieved. The lifetime of photoluminescence is ~2.2 ms at a stimulated emission cross-section σem of ~1.1 × 10(-21) cm(2) for ~ 5.0 × 10(21) cm(-3) Tb(3+). This results in an optical gain parameter σem*τ of ~2.5 × 10(-24) cm(2)s, what could be of interest for implemen...Continue Reading

References

Feb 15, 1984·Applied Optics·J A Davis, R M Bunch
Feb 9, 2008·Applied Optics·A N MalshakovA K Potemkin
Apr 15, 1982·Applied Optics·A B Villaverde, E C Vasconcellos
May 15, 2010·Inorganic Chemistry·Enrico CavalliPieter Dorenbos
Aug 9, 2011·Advanced Materials·Markus A SchmidtPhilip St J Russell

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Citations

Jun 4, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Fengchao WangShiqing Xu
Aug 9, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yasuchika HasegawaYukio Hinatsu
Jul 21, 2015·Applied Optics·Amrozia ShaheenMuhammad Sabieh Anwar
May 12, 2021·Scientific Reports·Douglas F FrancoMarcelo Nalin

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Methods Mentioned

BETA
differential scanning calorimetry
electron probe microanalysis
X-ray

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