Cooling to 208 K by optical refrigeration

Thiede, J.; Distel, J.; Greenfield, S. R.; Epstein, R. I.
April 2005
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p154107
Academic Journal
We report cooling to record low temperatures by optical refrigeration with ytterbium-doped zirconium–barium–lanthanum–aluminum–sodium-fluoride glass. The glass cooling element was mounted in vacuum in a low-thermal-emissivity chamber and pumped with the light from a diode-pumped solid state Yb:YAG (ytterbium-doped yttrium-aluminum-garnet) laser. Starting from room temperature, the glass cooling element reached a minimum temperature of ∼208 K when pumped with ∼10 W of 1026-nm light. The heat load at minimum temperature was ∼29 mW.


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