Transmission Degradation of Femtosecond Laser Pulses in Opened Cone Targets

• Published in: Plasma science & technology Vol. 14; no. 1; pp. 24 - 27
• Main Author: 刘峰 林晓宣 刘必成 丁文君 杜飞 李玉同 马景龙 刘晓龙 盛政明 陈黎明 鲁欣 董全力 王伟民 王兆华 魏志义 陈佳洱 张杰
• Format: Journal Article
• Language: English
• Published: 2012
• Subjects: 光学装置; 半导体技术; 开业; 激光传输; 激光能量; 等离子体产生; 降解; 飞秒激光脉冲
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/14/1/06

Irradiated by femtosecond laser pulses with different energies, opened cone targets behave very differently in the transmission of incident laser pulses. The targets, each with an opening angle of 71° and an opening of 5 μm, are fabricated using standard semiconductor technology. When the incident laser energy is low and no pre-plasma is generated on the side walls of the cones, the cone target acts like an optical device to reflect the laser pulse, and 15% of the laser energy can be transmitted through the cones. In contrast, when the incident laser energy is high enough to generate pre-plasmas by the pre-pulse of the main pulse that fills the inner cone, the cone with the plasmas will block the transmission of the laser, which leads to a decrease in laser transmission compared with the low-energy case with no plasma. Simulation results using optical software in the low-energy case, and using the particle-in-cell code in the high-energy case, are primarily in agreement with the experimental results.