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9 March 2020 The role of absorption saturation in optical refrigeration (Conference Presentation)
Azzurra Volpi, Jackson Kock, Alexander R. Albrecht, Markus P. Hehlen, Richard I. Epstein, Mansoor Sheik-Bahae
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Proceedings Volume 11298, Photonic Heat Engines: Science and Applications II; 1129809 (2020) https://doi.org/10.1117/12.2547681
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
The role of pump saturation in high-power optical refrigeration is investigated. Employing both Z-scan and intensity-dependent PL techniques, we measure the pump saturation intensity in Yb:YLF versus the temperature. We find that the absorption efficiency, and consequently the cooling efficiency can be limited at cryogenic temperatures under power scaling (when substantial heat lift is desired) unless multi-pass pumping schemes are tailored to control the average pump intensity inside the crystal.
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Azzurra Volpi, Jackson Kock, Alexander R. Albrecht, Markus P. Hehlen, Richard I. Epstein, and Mansoor Sheik-Bahae "The role of absorption saturation in optical refrigeration (Conference Presentation)", Proc. SPIE 11298, Photonic Heat Engines: Science and Applications II, 1129809 (9 March 2020); https://doi.org/10.1117/12.2547681
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KEYWORDS
Absorption
Cryogenics
Crystals
Temperature metrology
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