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, Azzurra Volpi, Giovanni Cittadino, Giovanni Cittadino, Alberto Di Lieto, Alberto Di Lieto, Arlete Cassanho, Arlete Cassanho, Hans P. Jenssen, Hans P. Jenssen, Mauro Tonelli, 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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