Time resolved thermal lens measurements of the thermo-optical properties of Nd2O3-doped low silica calcium aluminosilicate glasses down to 4.3 K |
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Authors: | NGC Astrath AN Medina AC Bento C Jacinto T Catunda SM Lima LM da Silva FG Gandra ML Baesso |
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Institution: | 1. Departamento de Física, Universidade Estadual de Maringá, 87020-900 Maringá – PR, Brazil;2. Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió – AL, Brazil;3. Instituto de Física de São Carlos, Universidade de São Paulo, USP, 13560-970 São Carlos – SP, Brazil;4. Grupo de Espectroscopia Óptica e Fototérmica, Universidade Estadual de Mato Grosso do Sul, 79804-970 Dourados – MS, Brazil;5. Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-970 Campinas – SP, Brazil |
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Abstract: | In this work, the thermal lens spectrometry was applied to measure the thermo-optical properties of Nd2O3-doped low silica calcium aluminosilicate glasses as a function of temperature, between 4.3 and 300 K. The thermal relaxation calorimetry was used to determine the specific heat, cp. The results showed a decrease of the thermal diffusivity of about one order of magnitude from 4.3 K up to 300 K, with a T?1 dependence in the interval between 20 and 70 K and a T?0.35 between 4.3 and 20 K. The fluorescence quantum efficiencies of the doped samples were calculated down to 50 K, showing a variation of the order of 12% and 25% for the samples with 0.6 and 1.04 mol% of Nd2O3, respectively. In addition, the temperature corresponding to the maximum in cp/T3, the so-called boson peak, was observed at about 17 K for the undoped sample and at lower temperatures for the doped glasses. In conclusion, our results showed the ability of the time resolved thermal lens to determine the thermo-optical properties of glasses at temperatures lower than 300 K, bringing new possibilities for experiments in a wide range of optical materials. |
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