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Discrimination between thermal quenching of the fluorescence and Auger upconversion processes using thermal lens technique |
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| Authors: | Viviane Pilla Hans P. Jenssen Tomaz Catunda |
| Affiliation: | a Instituto de Pesquisa e Desenvolvimento - IPD, Universidade do Vale do Paraíba - Univap, CEP 12244-000, São José dos Campos, SP, Brazil b Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, FL 32816, United States c AC Materials Inc., 2721 Forsyth Road, Winter Park, FL 32792, United States d Instituto de Física de São Carlos - IFSC, Universidade de São Paulo - USP, CEP 13560-970, São Carlos, SP, Brazil |
| Abstract: | In this work we used the Thermal Lens (TL) technique to discriminate two important processes responsible to reduce the upper-state population and fluorescence quantum efficiency (η) in Cr3+ doped colquiriite crystals: the thermal quenching of the fluorescence (TQF) and the Auger upconversion (ETU). We observed a nonlinear increase of the TL signal with laser power due to the decrease of η by ETU and/or TQF. The analysis of these curves allowed the determination of the thermal load, the increase of the crystal temperature as a function of the pump excitation and the discrimination between ETU and TQF processes. |
| Keywords: | 78.20.Nv 65.40.&minus b 78.55.&minus m |
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