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Proceedings Paper

Local internal and bulk optical cooling in Nd-doped crystals and nanocrystalline powders revisited
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Paper Abstract

In the present work, we report on infrared thermography measurements in Nd-doped KPb2Cl5 crystal and powder above and below the barycentre of the 4F3/2 level that were performed in order to assess the relative weights of both the direct anti-Stokes absorption processes and those assisted by either excited state absorption or energy transfer upconversion when cooling takes place in the material. As the laser induced temperature changes are usually small, we used a special configuration of the samples that allowed us to obtain differential measurements where an undoped sample acted as a temperature baseline. This method allows us to ascertain whether the recorded temperature changes are optically induced or they are due to some other effect.

Paper Details

Date Published: 9 February 2011
PDF: 10 pages
Proc. SPIE 7951, Laser Refrigeration of Solids IV, 795106 (9 February 2011); doi: 10.1117/12.875140
Show Author Affiliations
Angel J. Garcia-Adeva, Escuela Técnica Superior de Ingeniería (Spain)
Rolindes Balda, Escuela Técnica Superior de Ingeniería (Spain)
Ctr. de Física de Materiales CSIC-UPV/EHU and Donostia International Physics Ctr. (Spain)
Mohammed Al Saleh, Escuela Técnica Superior de Ingeniería (Spain)
Sara Garcia-Revilla, Escuela Técnica Superior de Ingeniería (Spain)
Joaquin Fernandez, Escuela Técnica Superior de Ingeniería (Spain)
Ctr. de Física de Materiales CSIC-UPV/EHU and Donostia International Physics Ctr. (Spain)


Published in SPIE Proceedings Vol. 7951:
Laser Refrigeration of Solids IV
Richard Epstein; Mansoor Sheik-Bahae, Editor(s)

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