Special Section on Optical Refrigeration and Radiation-Balanced Lasers

Investigation of Yb-doped LiLuF4 single crystals for optical cooling

[+] Author Affiliations
Azzurra Volpi, Giovanni Cittadino

Università di Pisa, Dipartimento di Fisica, Largo B. Pontecorvo 3, I-56127 Pisa, Italy

Alberto Di Lieto, Mauro Tonelli

Università di Pisa, Dipartimento di Fisica, Largo B. Pontecorvo 3, I-56127 Pisa, Italy

NEST Istituto di Nanoscienze—CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy

Arlete Cassanho, Hans P. Jenssen

AC Materials, Inc., 756 Anclote Road, Tarpon Springs, Florida 34689, United States

Opt. Eng. 56(1), 011105 (Oct 05, 2016). doi:10.1117/1.OE.56.1.011105
History: Received June 27, 2016; Accepted August 1, 2016
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Abstract.  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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Azzurra Volpi ; Giovanni Cittadino ; Alberto Di Lieto ; Arlete Cassanho ; Hans P. Jenssen, et al.
"Investigation of Yb-doped LiLuF4 single crystals for optical cooling", Opt. Eng. 56(1), 011105 (Oct 05, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011105


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