Development of 2D Shocks with Tunable Geometry and Profiles

We have developed an experimental setup to generate and measure 2D-confined shocks with~adjustable spatial~geometry and temporal profile. The~technique is demonstrated for waveguide shocks in three geometries: planar, colliding planar, and cylindrically converging. The shock profile for the waves may be temporally adjusted to set the duration of the stable high-pressure period and the onset of release. The laser-induced shock is generated~with an intense pump laser pulse~by imaging a partially reflecting mask onto an absorbing sample~layer. The mask sets the geometry of the shock by specifying the spatial~shape~of the drive laser (e.g. a linear or ring pattern of light) on the sample. Absorption-induced volume changes generate the shock within the thin sample layer. Confinement of the shock within the sample~occurs through the high impedance mismatch between the~layer and stiff surrounding~substrates. The~method is~demonstrated~for liquid and solid samples using phase and amplitude-sensitive single-shot multi-frame imaging.