Numéro
J. Phys. IV France
Volume 125, June 2005
Page(s) 221 - 223
DOI https://doi.org/10.1051/jp4:2005125052


J. Phys. IV France 125 (2005) 221-223

DOI: 10.1051/jp4:2005125052

Spectroscopic study of ds/dT in commercial filter by using the thermal lens technique

S.M. Lima1 and T. Catunda2

1  Universidade Estadual de Mato Grosso do Sul - UEMS, Grupo de Espectroscopia Óptica e Fototérmica, CP 351, Dourados, MS, Brazil
2  Universidade de São Paulo, Instituto de Física de São Carlos, CP 369, São Carlos, SP, Brazil


Abstract
In this work we report on the use of the Thermal Lens method in a spectroscopic form to investigate the dependence of the thermo-optical properties with the probe beam wavelength in a RG - 610 commercial filter close to the absorption maximum (around 650 nm). The measurements were performed using a tunable dye laser as probe source and an Ar+ laser at 514 nm as excitation one. Our results exhibit a strong dependence of the temperature coefficient of the optical path length change with the probe wavelength.



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