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Proceedings Paper

Designs and optical tests of thermal links for an optical refrigerator
Author(s): John Parker; David Mar; Steven Von der Porten; John Hankinson; Kevin Byram; Chris Lee; Kai Mayeda; Richard Haskell; Qimin Yang; Scott Greenfield; Richard Epstein
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Paper Abstract

Dielectric mirror leakage at large angles of incidence limits the effectiveness of solid state optical refrigerators due to reheating caused by photon absorption in an attached load. In this paper, we present several thermally conductive link solutions to greatly reduce the net photon absorption. The Los Alamos Solid State Optical Refrigerator (LASSOR) has demonstrated cooling of a Yb3+ doped ZBLANP glass to 208 K. We have designed optically isolating thermal link geometries capable of extending cooling to a typical heat load with minimal absorptive reheating, and we have tested the optical performance of these designs. A surrogate source operating at 625 nm was used to mimic the angular distribution of light from the LASSOR cooling element. While total link performance is dependent on additional factors, we have found that the best thermal link reduced the net transmission of photons to 0.04%, which includes the trapping mirrors 8.1% transmission. Our measurements of the optical performance of the various link geometries are supported by computer simulations of the designs using Code V, a commercially available optical modeling software package.

Paper Details

Date Published: 4 February 2008
PDF: 12 pages
Proc. SPIE 6907, Laser Refrigeration of Solids, 69070D (4 February 2008); doi: 10.1117/12.764166
Show Author Affiliations
John Parker, Harvey Mudd College (United States)
David Mar, Harvey Mudd College (United States)
Steven Von der Porten, Harvey Mudd College (United States)
John Hankinson, Harvey Mudd College (United States)
Kevin Byram, Harvey Mudd College (United States)
Chris Lee, Harvey Mudd College (United States)
Kai Mayeda, Harvey Mudd College (United States)
Richard Haskell, Harvey Mudd College (United States)
Qimin Yang, Harvey Mudd College (United States)
Scott Greenfield, Los Alamos National Lab. (United States)
Richard Epstein, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 6907:
Laser Refrigeration of Solids
Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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