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Spectroscopy of erbium-doped potassium double tungstate waveguides
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2017 (English)In: Integrated Optics: Devices, Materials, and  Technologies XXI, SPIE - International Society for Optical Engineering, 2017, Vol. 10106, article id 1010604Conference paper (Refereed)
Abstract [en]

We report the spectroscopy of crystalline waveguide amplifiers operating in the telecom C-band. Thin films of erbiumdoped gadolinium lutetium potassium double tungstate, KGdxLuyEr1-x-y (WO4)2, are grown by liquid-phase epitaxy onto undoped potassium yttrium double tungstate (KYW) substrates and micro-structured by Ar+-beam etching. Channel waveguides with erbium concentrations between 0.45-6.35 × 1020 cm-3 are characterized. The transition cross-sections of interest are estimated. The effect of energy-transfer up-conversion (ETU) is experimentally investigated. Microscopic and macroscopic ETU parameters are extracted from a simultaneous analysis of 20 decay curves of luminescence on the transition 4I13/2 → 4I15/2. The correlation between ETU and the doping concentration is studied. Pump excited-state absorption (ESA) on the transition 4I11/2 → 4F7/2 is investigated via a direct ESA measurement using a double-modulation pump-probe technique. The effect of ESA is studied for different pump wavelengths. The pump wavelength of 984.5 nm is found to be favorable for the complete range of erbium concentrations.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2017. Vol. 10106, article id 1010604
Series
Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 10106
Keywords [en]
Crystalline waveguides, EDWA, Rare-earth doped, Waveguide amplifiers
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URN: urn:nbn:se:kth:diva-216746DOI: 10.1117/12.2252488ISI: 000407041100002Scopus ID: 2-s2.0-85020313550ISBN: 9781510606531 (print)OAI: oai:DiVA.org:kth-216746DiVA, id: diva2:1153597
Conference
Integrated Optics: Devices, Materials, and Technologies XXI 2017, San Francisco, United States, 30 January 2017 through 1 February 2017
Note

QC 20171031

Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2017-10-31Bibliographically approved

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  • apa
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