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Abstract <p>A 30-fold increase in the energy of a quasi-unipolar terahertz radiation pulse in a remote focus was experimentally demonstrated for the regime of diffuse electron beam generation using a specially designed parabolic concentrator. The pulse of coherent terahertz radiation arose as a result of transition radiation of relativistic electrons accelerated by a femtosecond laser pulse of relativistic intensity (up to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(7\times 10^{18}\)</EquationSource> <!--BPhysMGU2570325Samsonov-m1--> </InlineEquation> W/cm<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({}^{2}\)</EquationSource> <!--BPhysMGU2570325Samsonov-m2--> </InlineEquation>) as these electrons exited the plasma layer. The plasma layer was created by exposing a 3 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\mu\)</EquationSource> <!--BPhysMGU2570325Samsonov-m3--> </InlineEquation>m thick ethanol jet to a nanosecond laser pulse with an intensity of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(10\times 10^{12}\)</EquationSource> <!--BPhysMGU2570325Samsonov-m4--> </InlineEquation> W/cm<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({}^{2}\)</EquationSource> <!--BPhysMGU2570325Samsonov-m5--> </InlineEquation>. Optimisation of the plasma layer parameters (maximum electron concentration and thickness) was achieved by varying the delay between the nanosecond and high-power femtosecond laser pulses.</p>

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Enhancement of the Efficiency of a Laser-Plasma Terahertz Radiation Source Using a Parabolic Concentrator

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. V. Samsonov,
  • I. N. Tsymbalov,
  • S. A. Shulyapov,
  • K. A. Ivanov,
  • A. B. Savel’ev

摘要

Abstract

A 30-fold increase in the energy of a quasi-unipolar terahertz radiation pulse in a remote focus was experimentally demonstrated for the regime of diffuse electron beam generation using a specially designed parabolic concentrator. The pulse of coherent terahertz radiation arose as a result of transition radiation of relativistic electrons accelerated by a femtosecond laser pulse of relativistic intensity (up to \(7\times 10^{18}\) W/cm \({}^{2}\) ) as these electrons exited the plasma layer. The plasma layer was created by exposing a 3 \(\mu\) m thick ethanol jet to a nanosecond laser pulse with an intensity of \(10\times 10^{12}\) W/cm \({}^{2}\) . Optimisation of the plasma layer parameters (maximum electron concentration and thickness) was achieved by varying the delay between the nanosecond and high-power femtosecond laser pulses.