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11 March 2013 Spectroscopic and life-time measurements of quantum dot doped glass for optical refrigeration: a feasibility study
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Proceedings Volume 8638, Laser Refrigeration of Solids VI; 86380I (2013)
Event: SPIE OPTO, 2013, San Francisco, California, United States
We show for the first time to our knowledge, measurements of anti-Stokes fluorescence and lifetime measurements in quantum dot (QD) doped glass, which has been proposed as a potential material for optical refrigeration recently. The glass host studied here is known as SNAB (SiO2, Na2CO3, Al2O3, B2O3) and is doped with PbS QDs. We show that when excited at a proposed pump wavelength (1550 nm) for cooling, anti-Stokes fluorescence is emitted, required for laser cooling. We also show fluorescence lifetime measurements in this glass, which is in the order of 500 ns. This lifetime is 3-4 orders of magnitude shorter than the typical lifetime of rare earth dopants in glass. From additional fluorescence spectrum measurements at a higher pumpenergy (1.064 μm), we estimate the quantum efficiency of such a system. The observation of anti-Stokes fluorescence and the short lifetime is evidence that QDs could be developed as potential candidates for laser cooling in the solid state, however improvements would have to be made in the quantum efficiency as well as in the background absorption of the host glass for successful applications.
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Sébastien Loranger, Antoine Lesage-Landry, Elton Soares de Lima Filho, Galina Nemova, Noelio O. Dantas, Paulo C. Morais, and Raman Kashyap "Spectroscopic and life-time measurements of quantum dot doped glass for optical refrigeration: a feasibility study", Proc. SPIE 8638, Laser Refrigeration of Solids VI, 86380I (11 March 2013);

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