J. Phys. IV France
Volume 125, June 2005
Page(s) 189 - 191

J. Phys. IV France 125 (2005) 189-191

DOI: 10.1051/jp4:2005125044

Influence of probe beam multi-reflection on thermal lens measurements: Application to Nd:YAG rods

A.R. Nunes1, J.H. Rohling1, A.N. Medina1, J.R.D. Pereira1, A.C. Bento1, M.L. Baesso1, L.A.O. Nunes2 and T. Catunda2

1  Departamento de Física, Universidade Estadual de Maringá, Maringá, PR, Brasil
2  Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brasil

In this work time resolved thermal lens measurements were carried out in Nd-doped yttrium aluminum garnet laser crystal. We observed that due to the probe beam multi-reflection the thermal lens signal was influenced by the moving fringes that occurred in front of the detector. By using a heat sink device, this effect was minimized permitting the determination of the temperature coefficient of optical path length, the thermal diffusivity and the thermal conductivity of the sample. As a complementary technique, the thermal relaxation method was used to measure the sample specific heat.

© EDP Sciences 2005