论文标题
激光引起的超薄靶标的损伤阈值及其对激光驱动离子加速度实验的激光对比度的约束
Laser-induced damage thresholds of ultrathin targets and their constrain on laser contrast in laser-driven ion acceleration experiments
论文作者
论文摘要
单发激光诱导的损伤阈值（LIDT）在真空环境中进行了多型自由型超薄箔的测量，以800 nm激光脉冲，持续时间为50 fs到200 ps。结果表明，超薄箔的激光损伤阈值（DTF）明显低于相应的大量材料。宽带隙介电靶标（例如SIN和FormVar）具有比半导体和导电目标的DTF更大的DTF，这取决于脉冲持续时间1-3个数量级。研究了不同类型目标的损伤机制。根据测量，讨论了LIDT在激光对比度上的约束。
Single-shot laser-induced damage threshold (LIDT) measurements of multi-type free-standing ultrathin foils were performed in vacuum environment for 800 nm laser pulses with durations τ ranging from 50 fs to 200 ps. Results show that the laser damage threshold fluences (DTFs) of the ultrathin foils are significantly lower than those of corresponding bulk materials. Wide band gap dielectric targets such as SiN and formvar have larger DTFs than those of semiconductive and conductive targets by 1-3 orders of magnitude depending on the pulse duration. The damage mechanisms for different types of targets are studied. Based on the measurement, the constrain of the LIDTs on the laser contrast is discussed.
