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arXiv · 2603.10630

Solid-state laser cooling of Yb3+-doped KY3F10 to 145 K

Luca Koldeweyh·Stefan Püschel·Zoe Liestmann·Hiroki Tanaka
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Abstract

We report laser cooling of Yb3+-doped KY3F10 (Yb:KY3F10) driven by a 100-W, 1020-nm pump source. Despite pumping at a non-optimal wavelength, high-quality KY3F10 crystals doped with 3% and 7% Yb were cooled to 145 K and 151 K, respectively, in a double-pass pump configuration. These results establish Yb:KY3F10 as an attractive laser-cooling medium competitive with Yb:YLF, the state-of-the-art laser-cooling material for optical cryocoolers. The observed cooling performance and spectroscopic characteristics suggest that lower cryogenic temperatures may be achieved through pump-wavelength optimization, enhanced pump absorption, and reduced radiative heating.

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Luca Koldeweyh, Stefan Püschel, Zoe Liestmann, Hiroki Tanaka. 2026-03-11. Solid-state laser cooling of Yb3+-doped KY3F10 to 145 K. https://arxiv.org/abs/2603.10630

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