Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping

Yean Sheng Yong, S. Aravazhi, Sergio Andrés Vázquez-Córdova, J.J. Carvajal, F. Diaz, Jennifer Lynn Herek, Sonia Maria García Blanco, Markus Pollnau

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Abstract

Radiation trapping occurs in rare-earth-doped active media with strong spectral overlap of luminescence and ground-state absorption. It is demonstrated experimentally that a confocal measurement mitigates the influence of radiation trapping on the measured luminescence lifetime, hence allowing for direct extraction of the lifetime from the measured decay curves. The radiation trapping effect is largely suppressed by probing a small sample volume and rejecting the photons reemitted from the unpumped region. This non-destructive measurement method is applied to ytterbium (Yb3+) activated potassium double tungstate crystalline layers with Yb3+ concentrations ranging from 1.2 at.% up to 76 at.% (~8 × 1019 – 5 × 1021 cm−3). The measured lifetime values are comparable to the results reported for Yb3+-doped potassium double tungstate powder diluted in liquid.
Original languageEnglish
Pages (from-to)527-532
JournalOptical materials express
Volume7
Issue number2
DOIs
Publication statusPublished - 2017

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Rare earths
Radiation
Potassium
Luminescence
Ytterbium
Powders
Ground state
Photons
Crystalline materials
Liquids
tungstate

Cite this

Yong, Y. S., Aravazhi, S., Vázquez-Córdova, S. A., Carvajal, J. J., Diaz, F., Herek, J. L., ... Pollnau, M. (2017). Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping. Optical materials express, 7(2), 527-532. https://doi.org/10.1364/OME.7.000527
Yong, Yean Sheng ; Aravazhi, S. ; Vázquez-Córdova, Sergio Andrés ; Carvajal, J.J. ; Diaz, F. ; Herek, Jennifer Lynn ; García Blanco, Sonia Maria ; Pollnau, Markus . / Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping. In: Optical materials express. 2017 ; Vol. 7, No. 2. pp. 527-532.
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abstract = "Radiation trapping occurs in rare-earth-doped active media with strong spectral overlap of luminescence and ground-state absorption. It is demonstrated experimentally that a confocal measurement mitigates the influence of radiation trapping on the measured luminescence lifetime, hence allowing for direct extraction of the lifetime from the measured decay curves. The radiation trapping effect is largely suppressed by probing a small sample volume and rejecting the photons reemitted from the unpumped region. This non-destructive measurement method is applied to ytterbium (Yb3+) activated potassium double tungstate crystalline layers with Yb3+ concentrations ranging from 1.2 at.{\%} up to 76 at.{\%} (~8 × 1019 – 5 × 1021 cm−3). The measured lifetime values are comparable to the results reported for Yb3+-doped potassium double tungstate powder diluted in liquid.",
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Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping. / Yong, Yean Sheng; Aravazhi, S.; Vázquez-Córdova, Sergio Andrés; Carvajal, J.J.; Diaz, F.; Herek, Jennifer Lynn; García Blanco, Sonia Maria; Pollnau, Markus .

In: Optical materials express, Vol. 7, No. 2, 2017, p. 527-532.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Yong, Yean Sheng

AU - Aravazhi, S.

AU - Vázquez-Córdova, Sergio Andrés

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AU - Diaz, F.

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AU - Pollnau, Markus

PY - 2017

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AB - Radiation trapping occurs in rare-earth-doped active media with strong spectral overlap of luminescence and ground-state absorption. It is demonstrated experimentally that a confocal measurement mitigates the influence of radiation trapping on the measured luminescence lifetime, hence allowing for direct extraction of the lifetime from the measured decay curves. The radiation trapping effect is largely suppressed by probing a small sample volume and rejecting the photons reemitted from the unpumped region. This non-destructive measurement method is applied to ytterbium (Yb3+) activated potassium double tungstate crystalline layers with Yb3+ concentrations ranging from 1.2 at.% up to 76 at.% (~8 × 1019 – 5 × 1021 cm−3). The measured lifetime values are comparable to the results reported for Yb3+-doped potassium double tungstate powder diluted in liquid.

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