Dynamics of laser ablative shock waves from one dimensional periodic structured surfaces

Laser ablative shock waves (LASWs) from one dimensional periodic structured surfaces (1D-PSS) on Aluminum metal is studied using time resolved shadowgraphy technique. 1D-PSS of triangular and sinusoidal periodic density profiles consisting of 288 lines per laser focal spot diameter (lp2ω0) with periodicity of 0.83 μm are used as targets. The SW properties such as propagation distance, velocity and pressure behind the shock front were compared with flat Aluminum surface of the target under the same experimental conditions. The possibility of tailoring the nature of LASWs with varying density profile on the surface is presented.