Confined plasma ablation for shock physics, plate launch and material dynamics

摘要

Confined plasma ablation for shock physics, plate launch, and material dynamics has several unique advantages over direct-drive laser plasma that allows the freely expanding plasma away from the ablated surface, thus reducing energy coupling to the surface of the specimen. By confining the plasma with a laser-transparent, high-impedance window, energy coupling from the plasma to the specimen under test can be increased by several orders. However, for confined ablation, the laser power density and energy fluence must be kept below the break down threshold of the confining window material. Confined ablation to accelerate flyer plates decouples the laser parameters from the shock profile imparted in a target by the plasma-accelerated flyer plate.