5 October 2016 Investigation of Yb-doped LiLuF4 single crystals for optical cooling
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Optical cooling of solids, relying on annihilation of lattice phonons via anti-Stokes fluorescence, is an emerging technology that is rapidly advancing. The development of high-quality Yb-doped fluoride single crystals definitely led to cryogenic and sub-100-K operations, and the potential for further improvements has not been exhausted by far. Among fluorides, so far the best results have been achieved with Yb-doped LiYF4 (YLF) single crystals, with a record cooling to 91 K of a stand-alone YLF:10%Yb. We report on preliminary investigation of optical cooling of an LiLuF4 (LLF) single crystal, an isomorph of YLF where yttrium is replaced by lutetium. Different samples of 5% Yb-doped LLF single crystals have been grown and optically characterized. Optical cooling was observed by exciting the Yb transition in single-pass at 1025 nm and the cooling efficiency curve has been measured detecting the heating/cooling temperature change as a function of pumping laser frequency.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Azzurra Volpi, Giovanni Cittadino, Alberto Di Lieto, Arlete Cassanho, Hans P. Jenssen, Mauro Tonelli, "Investigation of Yb-doped LiLuF4 single crystals for optical cooling," Optical Engineering 56(1), 011105 (5 October 2016). https://doi.org/10.1117/1.OE.56.1.011105 . Submission:

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