H. Liu 1,6G.-Q. Liao 2Y.-H. Zhang 1,6B.-J. Zhu 1,6[ ... ]D. Neely 3,4,†
Author Affiliations
Abstract
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3 Central Laser Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK
4 Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, UK
5 Department of Physics, York Plasma Institute, University of York, Heslington, York YO10 5DD, UK
6 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
7 Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
8 Space Science Department, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
A multichannel calorimeter system is designed and constructed which is capable of delivering single-shot and broad-band spectral measurement of terahertz (THz) radiation generated in intense laser–plasma interactions. The generation mechanism of backward THz radiation (BTR) is studied by using the multichannel calorimeter system in an intense picosecond laser–solid interaction experiment. The dependence of the BTR energy and spectrum on laser energy, target thickness and pre-plasma scale length is obtained. These results indicate that coherent transition radiation is responsible for the low-frequency component (${<}$1 THz) of BTR. It is also observed that a large-scale pre-plasma primarily enhances the high-frequency component (${>}$3 THz) of BTR.
multichannel calorimeter backward terahertz radiation generation mechanisms 
High Power Laser Science and Engineering
2019, 7(1): 010000e6
作者单位
摘要
上海理工大学 光电信息与计算机工程学院, 上海 200093
单色超快激光与气体介质相互作用成丝产生太赫兹波是当前产生宽频太赫兹辐射的一个重要途径。介绍了不同模型下单色场(波长为0.8 μm)超快激光与气体介质作用产生宽频强太赫兹辐射的产生机制,以及提升太赫兹波产生效率的几种方法。单色激光与气体介质作用产生太赫兹辐射的产生机制模型有渡越-切仑科夫辐射模型、激光有质动力模型和轫致辐射模型。研究表明,在拉丝周围外加横向电压、外加纵向电压和双拉丝的方法都能获得更强的太赫兹波。
太赫兹波 单色场 产生机制 terahertz wave monochromatic field generation mechanisms 
光学仪器
2017, 39(5): 28

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