Thermal-optical properties of Ga : La : S glasses measured by thermal lens technique
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Data
1999-05-01
Autores
Lima, S. M.
Catunda, T.
Baesso, M. L.
Vila, L. D.
Messaddeq, Younes [UNESP]
Stucchi, Elizabeth Berwerth [UNESP]
Ribeiro, SJL
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Elsevier B.V.
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In this work the quantitative theoretical treatment for two beam mode mismatched thermal lens spectrometry is applied to investigate the thermo-optical properties of chalcohalide (chalcolgenides and halides mixture) glasses. For the three kinds of glass studied the thermal diffusivity varied between 2.5 and 2.7 x 10(-3) cm(2) s(-1). Using these results and supposing Dulong-Petit specific heats we estimated the thermal conductivity and temperature ratio of optical path length (ds/dT) and temperature coefficient of refractive index (dn/dT). All samples had positive ds/dT(similar to 3.3 x 10(-6) K-1) and negative dn/dT (similar to -26 x 10(-6) K-1). The difference between these parameters and the change of signal are consequences of the expansion coefficient (13 x 10(-6) K-1) and refractive index (n similar to 2.6) of chalcohalides. (C) 1999 Elsevier B.V. B.V. All rights reserved.
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Journal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 247, p. 222-226, 1999.