Laser cooling with lead-salt colloidal quantum dots doped in a glass host

Galina Nemova; Raman Kashyap

doi:10.1117/12.909430

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8 February 2012 Laser cooling with lead-salt colloidal quantum dots doped in a glass host

Galina Nemova, Raman Kashyap

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Proceedings Volume 8275, Laser Refrigeration of Solids V; 82750B (2012) https://doi.org/10.1117/12.909430
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We present a scheme, in which colloidal lead-salt PbSe QDs doped in a glass host are used for laser cooling with anti- Stokes fluorescence. The relatively short (microsecond range) lifetime of the excited level of the PbSe QD allows the cooling process to be accelerated, and new materials with higher phonon energy to be used as hosts, which are normally considered unsuitable for cooling with rare-earth ions. The considerable increase (by ~10⁴) in the absorption cross section of PbSe QD in comparison with the absorption cross section of the rare-earth ions doped in glasses or crystals increases the efficiency of the cooling process considerably, lowering the pump power requirements.

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Galina Nemova and Raman Kashyap "Laser cooling with lead-salt colloidal quantum dots doped in a glass host", Proc. SPIE 8275, Laser Refrigeration of Solids V, 82750B (8 February 2012); https://doi.org/10.1117/12.909430

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