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9 March 2022 Hydrothermal morphology control of hexagonal sodium yttrium fluoride microcrystals for solid-state laser refrigeration
Greg Felsted, Anupum Pant, Alexander B. Bard, Xiaojing Xia, Danika R. Luntz-Martin, Siamak Dadras, Shuai Zhang, Nick Vamivakas, Peter J. Pauzauskie
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Proceedings Volume PC12018, Photonic Heat Engines: Science and Applications IV; PC120180C (2022) https://doi.org/10.1117/12.2611615
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Hexagonal sodium yttrium fluoride (β-NaYF) is a promising material for optical refrigeration due to the narrow crystal field splitting of the Yb(III) ion. However, growing single crystals of β-NaYF remains a challenge due to thermal expansion stresses during melt growth. We demonstrate a hydrothermal synthesis of β-NaYF with widely tunable aspect ratios that match computationally predicted cavity resonances. The β-NaYF microcrystals contain 10% Yb(III) cations and are used to build optomechanical laser-refrigeration cantilever devices. Laser refrigeration of these devices shows cooling up to 12.5°C, which is measured using the cantilever’s fundamental eigenfrequency and photoluminescence from the Yb(III) ions.
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Greg Felsted, Anupum Pant, Alexander B. Bard, Xiaojing Xia, Danika R. Luntz-Martin, Siamak Dadras, Shuai Zhang, Nick Vamivakas, and Peter J. Pauzauskie "Hydrothermal morphology control of hexagonal sodium yttrium fluoride microcrystals for solid-state laser refrigeration", Proc. SPIE PC12018, Photonic Heat Engines: Science and Applications IV, PC120180C (9 March 2022); https://doi.org/10.1117/12.2611615
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KEYWORDS
Sodium
Yttrium
Crystals
Solid state lasers
Laser crystals
Calibration
Ions
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