Mr. Skylar J. Higgs Profile

Skylar J. Higgs

at Loyola Univ Maryland

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Proceedings Article | 4 March 2022 Poster + Paper

Modeling temperature-dependent optical absorption in thulium-doped YAG

Kenneth Marcelino, Emily Garzon, Ashley Dwyer, Skylar Higgs, Joseph Ganem

Proceedings Volume 11997, 119970S (2022) https://doi.org/10.1117/12.2607654

KEYWORDS: Absorption, Thulium, YAG lasers, Temperature metrology, Crystals, Thermography, Absorbance, Thermal modeling, Systems modeling, Ions

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A general approach for modeling the temperature dependence of optical absorptions in rare earth-doped crystals is presented and applied to transitions in Tm³⁺:YAG. The model allows for the generation of calculated absorption spectra at any temperature. There is close agreement between the model and measurements conducted of optical absorption in Tm³⁺:YAG for the ³F₃ and ³H₄ manifolds between 50 and 300 K. A model of the temperature variation of optical absorption features is highly useful in the design of high-powered solid-state laser systems. In addition, it is shown that absorption into Tm³⁺:YAG can be used as an optical thermometer at cryogenic temperatures. Absorption data as a function of wavelength and temperature was obtained for a sample of 1% Tm³⁺:YAG, which was mounted inside a cryostat with optical access. Broadband light from a tungsten-filament lamp passed through the crystal and entered a 0.25 m monochrometer and was detected with a photomultiplier tube. Transmitted light was analyzed for two spectral ranges: 650 - 725 nm which includes absorption into the ³F₃ manifold, and 750 – 825 nm which includes absorption into the ³H₄ manifold. The data was compared to a model for absorption cross sections that includes the temperature dependence of homogeneous broadening mechanisms and thermalization within the ground state Stark levels. This approach to modeling the temperature dependence of optical absorption should have general applicability for other rare earth-doped crystals.

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