  The transient response of an elastic cylinder to a laser impact is studied.
When the laser source is a line perpendicular to the cylinder axis, modes
guided along the cylinder are generated. For a millimetric steel cylinder up to
ten narrow resonances can be locally detected by laser interferometry below 8
MHz. Most of these resonances correspond to Zero-Group Velocity guided modes
while a few others can be ascribed to thickness modes. We observe that the
theory describing the propagation of elastic waves in an isotropic cylinder is
not sufficient to precisely predict the resonance spectrum. In fact, the
texture of such elongated structure manifest as elastic anisotropy. Thus, a
transverse isotropic (TI) model is used to calculate the dispersion curves and
compare them with the measured one, obtained by moving the source along the
cylinder. The five elastic constants of a TI cylinder are adjusted leading to a
good agreement between measured and theoretical dispersion curves. Then, all
the resonance frequencies are satisfactorily identified.
