Denis V. Seletskiy,1 Seth D. Melgaard,1 Mansoor Sheik-Bahaehttps://orcid.org/0000-0001-5703-3653,1 Stefano Bigotta,2 Alberto DiLieto,2 Mauro Tonelli,2 Richard I. Epstein3
1The Univ. of New Mexico (United States) 2NEST-CNR-INFM, Univ. di Pisa (Italy) 3Los Alamos National Lab. (United States)
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We demonstrate first cryogenic operation in a Ytterbium doped YLF crystal by means of an optical refrigeration.
We have achieved cooling to 155 Kelvin absolute temperature with heat lift of 90 mW, exceeding performance of
multi-stack thermo-electric coolers. This progress was possible by pumping the system near the Stark-manifold
resonance of highly pure Yb:YLF crystal and careful thermal management in the cooling experiment. Detailed
spectroscopic analysis demonstrated that cooling to 110 Kelvin is currently possible if pumped exactly on that
resonance.
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Denis V. Seletskiy, Seth D. Melgaard, Mansoor Sheik-Bahae, Stefano Bigotta, Alberto DiLieto, Mauro Tonelli, Richard I. Epstein, "Optical refrigeration breaks the Peltier barrier: cooling Yb:YLF to 155K," Proc. SPIE 7614, Laser Refrigeration of Solids III, 761403 (18 February 2010); https://doi.org/10.1117/12.845049