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Optical Refrigeration to NIST Cryogenic Temperature at 123K

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Abstract

A record low temperature in optical refrigeration is demonstrated by cooling Yb:YLF crystal to 128K ± 5K (∼−150 C) at λ=1020 nm corresponding to its E4-E5 Stark manifold resonance. The estimated cooling power is 165 mW.

© 2012 Optical Society of America

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