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17 March 2023 Payload cooling to <125K using optical refrigeration in Yb:YLF
Jackson Kock, Alexander Albrecht, Duncan McGraw, Richard Epstein, Mansoor Sheik-Bahae
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Proceedings Volume PC12437, Photonic Heat Engines: Science and Applications V; PC1243706 (2023) https://doi.org/10.1117/12.2652253
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
A record cooling to <125 K of an all-solid-state optical cryocooler by the anti-Stokes fluorescence cooling of a 10% Yb:YLF crystal. The record cooling achievable by the employment of a novel textured-MgF2 thermal link which improves the thermal transport and fluorescence escape. Spectrally selective coatings on the multi-pass pump circulator mirrors tuned to be highly reflective for the pump wavelengths yet transmit longer wavelengths in the Stokes regime. The loss introduced prevents sufficient gain from building up leading to amplified spontaneous emission and lasing. The roles of other potential nonlinearities, such as pump saturation are investigated.
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Jackson Kock, Alexander Albrecht, Duncan McGraw, Richard Epstein, and Mansoor Sheik-Bahae "Payload cooling to <125K using optical refrigeration in Yb:YLF", Proc. SPIE PC12437, Photonic Heat Engines: Science and Applications V, PC1243706 (17 March 2023); https://doi.org/10.1117/12.2652253
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KEYWORDS
Luminescence
Cryocoolers
Crystals
Mirrors
Optical coatings
Reflectivity
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