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

Angel J. Garcia-Adeva; Rolindes Balda; Mohammed Al Saleh; Sara Garcia-Revilla; Joaquin Fernandez

doi:10.1117/12.875140

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9 February 2011 Local internal and bulk optical cooling in Nd-doped crystals and nanocrystalline powders revisited

Angel J. Garcia-Adeva, Rolindes Balda, Mohammed Al Saleh, Sara Garcia-Revilla, Joaquin Fernandez

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Proceedings Volume 7951, Laser Refrigeration of Solids IV; 795106 (2011) https://doi.org/10.1117/12.875140
Event: SPIE OPTO, 2011, San Francisco, California, United States

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 ⁴F_3/2 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.

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Angel J. Garcia-Adeva, Rolindes Balda, Mohammed Al Saleh, Sara Garcia-Revilla, and Joaquin Fernandez "Local internal and bulk optical cooling in Nd-doped crystals and nanocrystalline powders revisited", Proc. SPIE 7951, Laser Refrigeration of Solids IV, 795106 (9 February 2011); https://doi.org/10.1117/12.875140

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