Abstract:Various rare-earth doped solids can be cooled by anti-Stokes fluorescence, but only a few, particularly ytterbium (Yb)-doped LiYF4 (YLF), showed the potential to reach the cryogenic temperature regime (below 123 K). We propose to adopt cubic Yb-doped KY3F10 (Yb:KYF) for reaching sub-100 K cooling temperatures. The temperature-dependent spectroscopy of Yb:KYF and the comparison with Yb:YLF indicate its high potential to achieve lower cooling temperatures. The calculated figure-of-merit of laser cooling of Yb:KY… Show more
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