Influence of probe beam multi-reflection on thermal lens measurements: application to Nd:YAG RODS - Nunes, A. R.; Rohling, J. H.; Medina, A. N.; Pereira, J. R. D.; Bento, A. C.; Baesso, Mauro Luciano; Nunes, Luiz Antônio de Oliveira; Catunda, Tomaz (International Conference on Photoacoustic and Photothermal Phenomena - ICPPP, 2004)