Novel ultrafast particle beam and intense pulse radiation source driven by repetitive high-power femtosecond laser
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摘要: 超快强激光具有超快时域特性和高峰值功率特性。随着激光技术的迅猛发展，其脉冲重复频率也得到逐步提高，这种重频高功率飞秒激光为人类提供了前所未有的超快时间和超高强场等极端物理条件，为驱动产生新型超快粒子束源和强脉冲辐射源等前沿基础科学和交叉应用研究提供了新机遇、新途径和新方向。本文将主要介绍上海师范大学超快光物理研究团队基于重频高功率飞秒激光系统新建的新型超快光物理综合实验平台，以及近期围绕气体高次谐波、强太赫兹辐射源和高亮度超快电子束源产生及其相关应用研究方面所取得的研究进展，并简述了若干前沿物理的主要进展和未来的展望。Abstract: Ultrafast intense laser pulse possesses the characteristic of ultrafast time domain and high peak power. With the rapid development of laser technology, its pulse repetition rate has been gradually increased as well. This kind of repetitive high-power femtosecond laser provides the human beings the unprecedented extreme physical conditions in ultrafast time and ultrahigh intensity field, providing new opportunities, means and directions for driving frontier basic science and cross-application research, such as the generation of novel ultrafast particle beam and intense pulse radiation source. In this paper, we will mainly introduce the newly-built experimental platform by the ultrafast light physics team of Shanghai Normal University based on the repetitive high-power femtosecond laser system. The recent research progress on the generation of gas high-order harmonics, intense terahertz radiation sources, high-brightness ultrafast electron beam and the relevant practical applications are all included, as well with the resume of the main progress and future prospect in these frontier physics.
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图 1 上海师范大学超快光物理实验室研究平台
Figure 1. Experimental platform layout of the Ultrafast Light Physics laboratory (ULIP)
图 2 重频高功率飞秒激光系统光路整体结构分布图
Figure 2. Schematic of the overall optical layout for the repetitive high-power femtosecond laser system
图 3 0.8 kHz钛宝石激光系统（相干公司）及其输出参数
Figure 3. Key parameters of the 0.8 kHz Ti: sapphire laser system (Coherent)
图 4 0.8 kHz激光的能量长期稳定性与聚焦特性测量
Figure 4. Long-term energy stability and focal spot measurements of the 0.8 kHz laser pulse
图 7 压缩前后光谱与脉冲持续时间
Figure 7. Spectrum and pulse duration before and after the pulse compression
图 8 气体高次谐波的光斑和光谱
Figure 8. Beam pattern and spectra of the generated gas high-order harmonic
图 9 气压对谐波强度的影响
Figure 9. Influence of gas pressure on the intensity of high-order harmonic
图 10 太赫兹产生和诊断实验示意图。
Figure 10. Experimental schematic diagram of THz generation and characterization
图 11 金属丝长度对太赫兹光斑及偏振特性的影响
Figure 11. Effect of Wire Length on Terahertz Beam Spot and Polarization Properties
图 15 弱非线性尾波场中高品质电子束的注入与加速过程
Figure 15. High quality electron injection and acceleration in a weakly nonlinear wakefield
图 16 基于十太瓦级重频飞秒激光驱动的高亮度超快电子束产生实验结果
Figure 16. Experimental results for high brightness ultrafast electron beam generation based on a 10 TW repetitive femtosecond laser
图 17 准线性尾波场加速产生超低能散度的高能粒子束
Figure 17. Ultralow-energy-spread high-energy particle beam generation via quasi-linear wakefield acceleration
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