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<p>THz field emission has been examined in the context of laser–plasma interactions involving two laser beams with a beat frequency difference, interacting with a density-modulated plasma. Laser pulses characterized by steep gradients in their spatial field envelope significantly influence plasma dynamics during the interaction. In this study, steep-edged laser pulses are employed within density-rippled plasmas to facilitate THz field generation. The necessary conservation of momentum and energy is ensured through the introduction of a density ripple in the uniform plasma, manifested as a static ion acoustic wave.The beat envelope of the steep laser pulses induces stronger nonlinear current, and hence an enhanced THz field is observed. The amplitude of the THz field has been evaluated as a function of resonant frequency and transverse displacement from the propagation axis. Additionally, the conversion efficiency of the proposed mechanism has been estimated to lie within the range of 0.001 to 0.01.</p>

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Effect of laser field distribution on laser plasma-based THz emission

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Arnika Sharma,
  • Ashish.,
  • Anuj Vijay,
  • Krishna Gopal

摘要

THz field emission has been examined in the context of laser–plasma interactions involving two laser beams with a beat frequency difference, interacting with a density-modulated plasma. Laser pulses characterized by steep gradients in their spatial field envelope significantly influence plasma dynamics during the interaction. In this study, steep-edged laser pulses are employed within density-rippled plasmas to facilitate THz field generation. The necessary conservation of momentum and energy is ensured through the introduction of a density ripple in the uniform plasma, manifested as a static ion acoustic wave.The beat envelope of the steep laser pulses induces stronger nonlinear current, and hence an enhanced THz field is observed. The amplitude of the THz field has been evaluated as a function of resonant frequency and transverse displacement from the propagation axis. Additionally, the conversion efficiency of the proposed mechanism has been estimated to lie within the range of 0.001 to 0.01.