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9 March 2022 Advances in the optical refrigeration of silica: cooling by 18 K from room temperature
Brian Topper, Mostafa Peysokhan, Alexander R. Albrecht, Angel S. Flores, Stefan Kuhn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik-Bahae, Arash Mafi
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Proceedings Volume PC12018, Photonic Heat Engines: Science and Applications IV; PC1201808 (2022) https://doi.org/10.1117/12.2610103
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Record laser cooling of Yb-doped silica by 18.4 K and 6.3 K was observed in vacuum and atmospheric pressure conditions, respectively. We present a detailed investigation into the optical refrigeration of ytterbium doped silica glass for both in-air and in-vacuum conditions using various pump powers. Temperature measurements were made relative to the room temperature using thermal camera imaging and differential luminescence thermometry. Through analysis of the temporal behavior of the temperature differential at the start of the in-vacuum experiments, we find the cooling efficiency of the studied silicates to be 0.66 ± 0.07%.
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Brian Topper, Mostafa Peysokhan, Alexander R. Albrecht, Angel S. Flores, Stefan Kuhn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik-Bahae, and Arash Mafi "Advances in the optical refrigeration of silica: cooling by 18 K from room temperature", Proc. SPIE PC12018, Photonic Heat Engines: Science and Applications IV, PC1201808 (9 March 2022); https://doi.org/10.1117/12.2610103
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KEYWORDS
Silica
Optical fibers
Temperature metrology
Ytterbium
Cameras
Glasses
High power fiber amplifiers
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