Thermo-optics parameters measurements in photorefractive sillenite 'BI IND. 12''SI''O IND. 20' crystals by thermal lens technique - Gesualdi, M. R. R.; Jacinto, C.; Andrade, A. A.; Catunda, Tomaz; Muramatsu, Mikiya (Journal of Optoelectronics and Advanced Materials, 2011)