Laser cooling with nanoparticles

Galina Nemova; Elton Soares de Lima Filho; Sebastien Loranger; Raman Kashyap

doi:10.1117/12.2001317

24 October 2012 Laser cooling with nanoparticles

Galina Nemova, Elton Soares de Lima Filho, Sebastien Loranger, Raman Kashyap

Proceedings Volume 8412, Photonics North 2012; 84121P (2012) https://doi.org/10.1117/12.2001317
Event: Photonics North 2012, 2012, Montréal, Canada

Abstract

Theoretical schemes for laser cooling with nanoparticles have been presented and comprehensively investigated. It is shown that specially designed samples based on nanoparticles can be used to improve the process of laser cooling of solids. One of the proposed schemes is based on lead salt colloidal quantum dots (QDs) doped in a glass host. The second one is based on Tm³⁺ doped oxy fluoride glass ceramic. It has been shown that lead salt colloidal QDs doped in a glass host can operate as artificial atoms. Very short (microsecond range) radiative lifetimes of the excited 1Sh level of PbSe QDs in comparison with the relatively long (millisecond) radiative lifetime of rare-earth (RE) ions allows the cooling process to be accelerated and to use new hosts with relatively high maximum phonon energy, which have so far been considered not suitable for cooling with RE ions. It has been shown that the second sample, which is based on Tm³⁺ doped oxy fluoride glass ceramic provides the unique combination of high chemical and mechanical stability of the oxide glass, which is important for a number of applications, and the low phonon energy of the fluoride nano-crystals, which trap a majority of Tm³⁺ ions participating in the cooling process. This is highly beneficial for laser cooling of solids, since the effective embedding of rare-earth ions in the crystalline phase with low phonon energy provides a high quantum efficiency for the ³F₄ → ³H₆ transition involved in the cooling cycle in the Tm³⁺ ions, which is a key parameter for laser cooling of solids.

Citation Download Citation

Galina Nemova, Elton Soares de Lima Filho, Sebastien Loranger, and Raman Kashyap "Laser cooling with nanoparticles", Proc. SPIE 8412, Photonics North 2012, 84121P (24 October 2012); https://doi.org/10.1117/12.2001317

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