High Power Laser Science and Engineering, Vol. 8, Issue 4, 04000e41 (2020)
Laser-induced damage thresholds of ultrathin targets and their constraint on laser contrast in laser-driven ion acceleration experiments
Dahui Wang1,2, Yinren Shou1, Pengjie Wang1, Jianbo Liu1, Zhusong Mei1, Zhengxuan Cao1, Jianmin Zhang2, Pengling Yang2, Guobin Feng2, Shiyou Chen1, Yanying Zhao1, Joerg Schreiber3, and Wenjun Ma1,*
- 1State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing100871, China
- 2State Key Laborartory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi’an710024, China
- 3Fakultät für Physik, Ludwig-Maximilians-University, D-85748Garching, Germany
Single-shot laser-induced damage threshold (LIDT) measurements of multi-type free-standing ultrathin foils were performed in a vacuum environment for 800 nm laser pulses with durations τ ranging from 50 fs to 200 ps. The 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 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.
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