J. Phys. IV France 125 (2005) 221-223
Spectroscopic study of ds/dT in commercial filter by using the thermal lens techniqueS.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
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.
© EDP Sciences 2005