Performance Study of 266nm UV Nanosecond Laser Micromachined Glow Discharge Polymer Films

Glow discharge polymer (GDP) is the target of choice for ICF ignition due to its low density, dense structure, absence of grain boundary defects, infrared transparency and high surface finish, which can effectively reduce the initial perturbation of the implosion process and thus suppress RT instability during ICF implosion. In the process of ignition, in order to ensure that the energy of the ignition laser can be deposited near the compressed fuel core, specific microstructures need to be machined on the surface of the target pellet and relatively high requirements are placed on the surface quality of these microstructures. In recent years, laser ablation techniques have been widely used for the micro and nano processing of polymers due to their ability to produce precise microstructures. In this paper, laser processing experiments were conducted on GDP materials, and the processed surfaces were observed using scanning electron microscopy (SEM). Variations in processing parameters were used to obtain the effect of laser ablation on the surface morphology of GDP materials. With an increase in laser energy density, the surface quality of the GDP material decreased, and the heat-affected zone became larger.As the scanning speed increases, the surface quality of the GDP material improves and the heat-affected zone becomes smaller. As the number of scans increases, the surface quality of the GDP material can be maintained at lower scan rates, and then starts to decrease as the number of scans increases further.