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The recent achievements devoted to cooling of solids with a laser are presented in this paper. We discuss the latest
results of traditional laser cooling of solids based on rare earth ions and new techniques based on colloidal lead-salt
quantum dots doped in a glass host, laser cooling in Tm3+-doped oxy-fluoride glass ceramic. Relatively short
(microsecond) lifetime of the excited level of the PbSe QDs compared to the millisecond lifetime of the excited level of
RE ions allows an acceleration of the cooling process and provides an opportunity to use new materials with higher
phonon energy as hosts, which are normally considered unsuitable for cooling with RE ions. Another new approach to
the laser cooling problem based on super-radiance has been considered in this paper. The advantages of optical
refrigeration with rare earth doped semiconductors, in which not only optically active electrons of the 4f shell but the
valence and conduction bands of the host material are involved in cooling cycle is discussed. It is shown that involving
the valence and conduction bands of the host in the cooling cycle allows the pump wavelength to be shorter than mean
fluorescence wavelength. Raman laser cooling of solids as well as observation of spontaneous Brillouin cooling have
been presented.
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Galina Nemova, Raman Kashyap, "Recent advances in laser cooling of solids," Proc. SPIE 8915, Photonics North 2013, 89151T (11 October 2013); https://doi.org/10.1117/12.2037972