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Optical refrigeration to 119 K, below National Institute of Standards and Technology cryogenic temperature

2013; Optica Publishing Group; Volume: 38; Issue: 9 Linguagem: Inglês

10.1364/ol.38.001588

1539-4794

Seth D. Melgaard, Denis V. Seletskiy, A. Di Lieto, M. Tonelli, Mansoor Sheik‐Bahae,

Cold Atom Physics and Bose-Einstein Condensates

We report on bulk optical refrigeration of Yb:YLF crystal to a temperature of ∼124 K, starting from the ambient. This is achieved by pumping the E4-E5 Stark multiplet transition at ∼1020 nm. A lower temperature of 119±1 K (∼−154C) with available cooling power of 18 mW is attained when the temperature of the surrounding crystal is reduced to 210 K. This result is within only a few degrees of the minimum achievable temperature of our crystal and signifies the bulk solid-state laser cooling below the National Institute of Standards and Technology (NIST)-defined cryogenic temperature of 123 K.