4 February 2008 Designs and optical tests of thermal links for an optical refrigerator
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John Parker, John Parker, David Mar, David Mar, Steven Von der Porten, Steven Von der Porten, John Hankinson, John Hankinson, Kevin Byram, Kevin Byram, Chris Lee, Chris Lee, Kai Mayeda, Kai Mayeda, Richard Haskell, Richard Haskell, Qimin Yang, Qimin Yang, Scott Greenfield, Scott Greenfield, Richard Epstein, Richard Epstein, "Designs and optical tests of thermal links for an optical refrigerator", Proc. SPIE 6907, Laser Refrigeration of Solids, 69070D (4 February 2008); doi: 10.1117/12.764166; https://doi.org/10.1117/12.764166


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