Diffraction of picosecond bulk longitudinal and shear waves in micron thick films B. Audoin, M. Perton, N. Chigarev and C. Rossignol Eur. Phys. J. Special Topics, 153 (2008) 235-237 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00434-4