Abstract Optical cooling using anti-stokes fluorescence in solids and liquids appears to have several advantages over more conventional techniques and has been the topic of recent analysis and experimental work by numerous organizations. Significant cooling of as much as 65 K below ambient temperature has been reported for isolated samples of cooling material. In this paper, we address the problem of thermally connecting the optical cooling element to the cooling load, without having the load heated by absorbed fluorescence. To date, it has been assumed that the load could be shielded from the fluorescence by the use of high performance dielectric mirror stacks in series with the thermal connection. We have done extensive analysis of these mirror stacks, using commercially available software, and have found that significant leakage occurs at large angles of incidence. Since the fluorescence is emitted from the cooling material isotropically, the leakage and resulting absorption at the load can be large enough to negate the cooling effect. We have investigated several variations in mirror design and have concluded that the leakage appears to be inherent to all dielectric mirror stacks and cannot be significantly mitigated through mirror design. We have formulated a solution to this problem and incorporated the solution into our laboratory optical cryocooler.
Dielectric Mirror Leakage and Its Effects on Optical Cryocooling
Cryocoolers 12 ; 687-692
2003-01-01
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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