Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content

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

We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43(WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24(WO4)2, specifically at the central absorption line near 981 nm wavelength, which is important for amplifiers and lasers. The absorption cross-section of both thin films is found to be similar to those of bulk potassium rare-earth double tungstates, suggesting that the crystalline layers retain their spectroscopic properties albeit having >50 at.% Yb3+ concentration. The influence of sample temperature is investigated and found to substantially affect the measured absorption cross-section. Since amplifiers and lasers typically operate above room temperature due to pump-induced heating, the temperature dependence of the peak-absorption cross-section of the KYb0.57Gd0.43(WO4)2 is evaluated for the sample being heated from 20 °C to 170 °C, resulting in a measured reduction of peak-absorption cross-section at the transitions near 933 nm and 981 nm by ~40% and ~52%, respectively. It is shown that two effects, the change of Stark-level population and linewidth broadening due to intra-manifold relaxation induced by temperature-dependent electron-phonon interaction, contribute to the observed behavior. The effective emission cross-sections versus temperature have been calculated. Luminescence-decay measurements show no significant dependence of the luminescence lifetime on temperature.
Original languageEnglish
Pages (from-to)26825-26837
JournalOptics express
Volume24
Issue number23
DOIs
Publication statusPublished - 2016

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tungstates
ytterbium
absorption cross sections
potassium
amplifiers
luminescence
lutetium
temperature
gadolinium
thin films
electron phonon interactions
lasers
rare earth elements
pumps
life (durability)
temperature dependence
heating
cross sections
decay
room temperature

Keywords

  • METIS-320226

Cite this

Yong, Y. S., Aravazhi, S., Vázquez-Córdova, S. A., Carvajal, J. J., Diaz, F., Herek, J. L., ... Pollnau, M. (2016). Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content. Optics express, 24(23), 26825-26837. https://doi.org/10.1364/OE.24.026825
Yong, Yean Sheng ; Aravazhi, S. ; Vázquez-Córdova, Sergio Andrés ; Carvajal, J.J. ; Diaz, F. ; Herek, Jennifer Lynn ; García Blanco, Sonia Maria ; Pollnau, Markus. / Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content. In: Optics express. 2016 ; Vol. 24, No. 23. pp. 26825-26837.
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title = "Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content",
abstract = "We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43(WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24(WO4)2, specifically at the central absorption line near 981 nm wavelength, which is important for amplifiers and lasers. The absorption cross-section of both thin films is found to be similar to those of bulk potassium rare-earth double tungstates, suggesting that the crystalline layers retain their spectroscopic properties albeit having >50 at.{\%} Yb3+ concentration. The influence of sample temperature is investigated and found to substantially affect the measured absorption cross-section. Since amplifiers and lasers typically operate above room temperature due to pump-induced heating, the temperature dependence of the peak-absorption cross-section of the KYb0.57Gd0.43(WO4)2 is evaluated for the sample being heated from 20 °C to 170 °C, resulting in a measured reduction of peak-absorption cross-section at the transitions near 933 nm and 981 nm by ~40{\%} and ~52{\%}, respectively. It is shown that two effects, the change of Stark-level population and linewidth broadening due to intra-manifold relaxation induced by temperature-dependent electron-phonon interaction, contribute to the observed behavior. The effective emission cross-sections versus temperature have been calculated. Luminescence-decay measurements show no significant dependence of the luminescence lifetime on temperature.",
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author = "Yong, {Yean Sheng} and S. Aravazhi and V{\'a}zquez-C{\'o}rdova, {Sergio Andr{\'e}s} and J.J. Carvajal and F. Diaz and Herek, {Jennifer Lynn} and {Garc{\'i}a Blanco}, {Sonia Maria} and Markus Pollnau",
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Yong, YS, Aravazhi, S, Vázquez-Córdova, SA, Carvajal, JJ, Diaz, F, Herek, JL, García Blanco, SM & Pollnau, M 2016, 'Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content' Optics express, vol. 24, no. 23, pp. 26825-26837. https://doi.org/10.1364/OE.24.026825

Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content. / Yong, Yean Sheng; Aravazhi, S.; Vázquez-Córdova, Sergio Andrés; Carvajal, J.J.; Diaz, F.; Herek, Jennifer Lynn; García Blanco, Sonia Maria; Pollnau, Markus.

In: Optics express, Vol. 24, No. 23, 2016, p. 26825-26837.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content

AU - Yong, Yean Sheng

AU - Aravazhi, S.

AU - Vázquez-Córdova, Sergio Andrés

AU - Carvajal, J.J.

AU - Diaz, F.

AU - Herek, Jennifer Lynn

AU - García Blanco, Sonia Maria

AU - Pollnau, Markus

N1 - Open access

PY - 2016

Y1 - 2016

N2 - We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43(WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24(WO4)2, specifically at the central absorption line near 981 nm wavelength, which is important for amplifiers and lasers. The absorption cross-section of both thin films is found to be similar to those of bulk potassium rare-earth double tungstates, suggesting that the crystalline layers retain their spectroscopic properties albeit having >50 at.% Yb3+ concentration. The influence of sample temperature is investigated and found to substantially affect the measured absorption cross-section. Since amplifiers and lasers typically operate above room temperature due to pump-induced heating, the temperature dependence of the peak-absorption cross-section of the KYb0.57Gd0.43(WO4)2 is evaluated for the sample being heated from 20 °C to 170 °C, resulting in a measured reduction of peak-absorption cross-section at the transitions near 933 nm and 981 nm by ~40% and ~52%, respectively. It is shown that two effects, the change of Stark-level population and linewidth broadening due to intra-manifold relaxation induced by temperature-dependent electron-phonon interaction, contribute to the observed behavior. The effective emission cross-sections versus temperature have been calculated. Luminescence-decay measurements show no significant dependence of the luminescence lifetime on temperature.

AB - We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43(WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24(WO4)2, specifically at the central absorption line near 981 nm wavelength, which is important for amplifiers and lasers. The absorption cross-section of both thin films is found to be similar to those of bulk potassium rare-earth double tungstates, suggesting that the crystalline layers retain their spectroscopic properties albeit having >50 at.% Yb3+ concentration. The influence of sample temperature is investigated and found to substantially affect the measured absorption cross-section. Since amplifiers and lasers typically operate above room temperature due to pump-induced heating, the temperature dependence of the peak-absorption cross-section of the KYb0.57Gd0.43(WO4)2 is evaluated for the sample being heated from 20 °C to 170 °C, resulting in a measured reduction of peak-absorption cross-section at the transitions near 933 nm and 981 nm by ~40% and ~52%, respectively. It is shown that two effects, the change of Stark-level population and linewidth broadening due to intra-manifold relaxation induced by temperature-dependent electron-phonon interaction, contribute to the observed behavior. The effective emission cross-sections versus temperature have been calculated. Luminescence-decay measurements show no significant dependence of the luminescence lifetime on temperature.

KW - METIS-320226

U2 - 10.1364/OE.24.026825

DO - 10.1364/OE.24.026825

M3 - Article

VL - 24

SP - 26825

EP - 26837

JO - Optics express

JF - Optics express

SN - 1094-4087

IS - 23

ER -