11 March 2013 Optical refrigeration progress: cooling below NIST cryogenic temperature of 123K
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Proceedings Volume 8638, Laser Refrigeration of Solids VI; 863804 (2013) https://doi.org/10.1117/12.2005281
Event: SPIE OPTO, 2013, San Francisco, California, United States
Abstract
We have achieved cryogenic optical refrigeration with a record low temperature in optical refrigeration by cooling 5% wt.Yb:YLF crystal to 119K ±1K (~-154 C) at 1=1020 nm corresponding to its E4-E5 Stark manifold resonance with an estimated cooling power of 18 mW. This demonstration confirms the predicted minimum achievable temperature (MAT). Further cooling is achievable as shown by measurements of a doping study where a 10% wt. Yb:YLF crystal with reduced parasitic heating has predicted cooling below 100K (~-173K).
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Seth D. Melgaard, Denis V. Seletskiy, Alberto Di Lieto, Mauro Tonelli, Mansoor Sheik-Bahae, "Optical refrigeration progress: cooling below NIST cryogenic temperature of 123K", Proc. SPIE 8638, Laser Refrigeration of Solids VI, 863804 (11 March 2013); doi: 10.1117/12.2005281; https://doi.org/10.1117/12.2005281
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