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

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