Nonlinear photothermal and photoacoustic processes for crack detection G. Grégoire, V. Tournat, D. Mounier and V. E. Gusev Eur. Phys. J. Special Topics, 153 (2008) 313-315 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00453-1