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Proceedings Paper

Thermal modeling for an optical refrigerator
Author(s): K. W. Martin; Jason Schomacker; T. Fraser; C. Dodson
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Paper Abstract

Optical refrigeration is currently the only completely solid state cooling method capable of reaching cryogenic temperatures from room temperature. Optical cooling utilizing Yb:YLF as the refrigerant crystal has resulted in temperatures lower than 123K measured via a fluorescence thermometry technique. However, to be useful as a refrigerator this cooling crystal must be attached to a sensor or other payload. The phenomenology behind laser cooling, known as anti-Stokes fluorescence, has a relatively low efficiency which makes the system level optimization and limitation of parasitic losses imperative. We propose a variety of potential designs for a final optical refrigerator, enclosure and thermal link; calculate conductive and radiative losses, and estimate direct fluorescence reabsorption. Our simulated designs show losses between 60 and 255 mW, depending on geometry and enclosure choice, with a lower bound as low as 23 mW.

Paper Details

Date Published: 10 March 2015
PDF: 8 pages
Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 93800J (10 March 2015); doi: 10.1117/12.2077254
Show Author Affiliations
K. W. Martin, Air Force Research Lab. (United States)
Applied Technology Associates (United States)
Jason Schomacker, Rensselaer Polytechnic Institute (United States)
T. Fraser, Air Force Research Lab. (United States)
C. Dodson, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 9380:
Laser Refrigeration of Solids VIII
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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