Thermal modeling for an optical refrigerator

K. W. Martin; Jason Schomacker; T. Fraser; C. Dodson

doi:10.1117/12.2077254

10 March 2015 Thermal modeling for an optical refrigerator

K. W. Martin, Jason Schomacker, T. Fraser, C. Dodson

Proceedings Volume 9380, Laser Refrigeration of Solids VIII; 93800J (2015) https://doi.org/10.1117/12.2077254
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

Citation Download Citation

K. W. Martin, Jason Schomacker, T. Fraser, and C. Dodson "Thermal modeling for an optical refrigerator", Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 93800J (10 March 2015); https://doi.org/10.1117/12.2077254

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