Otro
Thermal-optical properties of Ga : La : S glasses measured by thermal lens technique
Registro en:
Journal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 247, p. 222-226, 1999.
0022-3093
10.1016/S0022-3093(99)00066-6
WOS:000080506900039
Autor
Lima, S. M.
Catunda, T.
Baesso, M. L.
Vila, L. D.
Messaddeq, Younes
Stucchi, Elizabeth Berwerth
Ribeiro, SJL
Resumen
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.