English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/101874
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Anti-Stokes laser-induced cooling in rare-earth doped low phonon materials

AuthorsFernández, Joaquín ; García-Adeva, Ángel J.; Balda, Rolindes
KeywordsRare-earths
Optical properties
Ytterbium
Erbium
Laser cooling
Issue Date2012
PublisherElsevier
CitationOptical Materials 34(3): 579-590 (2012)
AbstractIn this work we discuss the anti-Stokes laser-induced cooling of two matrices doped with Yb3+ and Er3+: a low phonon KPb2Cl5 crystal and a fluorochloride glass. In order to assess the presence of internal cooling in these systems we used photothermal deflection and conventional excitation spectroscopic techniques, whereas the bulk cooling in the Er3+-doped materials was detected by means of a calibrated thermal sensitive camera. Furthermore, we also consider some of our findings on cooling processes occurring in Yb3+-doped low phonon materials from a theoretical perspective. The experimental results are in good agreement with the predictions of a model based on the presence of a second order process in the cooling mechanism. The fluorescence excess shown by the excitation spectra of Yb3+-doped sample obtained at high fluences, by pumping at wavelengths in the cooling region, has been explained in the framework of the configurational coordinate model by considering that the frequencies of the vibrational modes in the ground and excited states change at high pumping intensities (quadratic coupling mode). In the case of Er3+ ion, it is worthwhile to mention that the cooling was observed in the spectral region where some upconversion processes that initiate at the pumped 4I9/2 level occur. Together with the spectroscopic characterization, a short discussion on the experimental and theoretical background of the cooling process including the possible influence of upconversion processes is presented.
URIhttp://hdl.handle.net/10261/101874
DOI10.1016/j.optmat.2011.05.037
Identifiersdoi: 10.1016/j.optmat.2011.05.037
issn: 0925-3467
e-issn: 1873-1252
Appears in Collections:(CFM) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.