Artículos de revistas
Thermal-optical properties of Ga : La : S glasses measured by thermal lens technique
Fecha
1999-05-01Registro 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
2998503841917815
9430703714241591
6446047463034654
Autor
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Maringá (UEM)
Institución
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.