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. © 2013 Optical Society of America
Optical refrigeration to 119 K, below National Institute of Standards and Technology cryogenic temperature
DI LIETO, ALBERTO;TONELLI, MAURO;
2013-01-01
Abstract
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. © 2013 Optical Society of AmericaFile | Dimensione | Formato | |
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