Study of backward terahertz radiation from intense picosecond laser-solid interactions using a multichannel calorimeter system

H. Liu, G.-Q. Liao, Y.-H. Zhang, B.-J. Zhu, Z. Zhang, Y.-T. Li, G. G. Scott, D. Rusby, C. Armstrong, E. Zemaityte, P. Bradford, N. Woolsey, P. Huggard, P. McKenna, D. Neely

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Abstract

A multichannel calorimeter system is designed and constructed which is capable of delivering single-shot and broad-band spectral measurement of Terahertz radiation generated in intense laser-plasma interactions. The generation mechanism of backward THz radiation is studied 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 largescale pre-plasma primarily enhance the high frequency component (> 3 THz) of BTR.
Original languageEnglish
Article numbere6
Number of pages7
JournalHigh Power Laser Science and Engineering
Volume7
DOIs
Publication statusPublished - 22 Jan 2019

Keywords

  • multichannel calorimeter
  • backward Terahertz radiation
  • generation mechanisms

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