Preparation of surface perturbation figures for targets by laser interference

The surface perturbation target is one of the most important experimental targets for the resolved experiments of inertial-confinement fusion (ICF). In the paper, the preparation of the sine-modulated perturbation figures with perturbation amplitude and wavelength of about several and tens of micron respectively with the method of laser interference is reported. The perturbation profiles of the figures are investigated by an alpha-step device and an optical microscopic profile. Different technological conditions, preparation process and their relationship with the quality of the figures are studied. Also, the mold with sine perturbation surface is obtained by electro-chemical plating