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<p>A concept for the generation of short, relativistically strong femtosecond pulse is proposed. Self-compression, group velocity dispersion (GVD) and self-phase modulation (SPM), are given particular attention in the study. The interaction of Cosh-Gaussian laser with plasma, causes a change in the phase of the laser pulse and alters the plasma’s refractive index, leading to laser pulse spectral broadening. It is worth noticing that, the laser in plasma shows opposite GVD compared to other media like solid. This exclusive behavior permits laser pulse to experience dispersion compensation while broadening the spectrum, eventually leading to self-compression. The numerical model, performed using the paraxial approach demonstrates how these phenomena contribute to the self-compression of a 200&#xa0;fs laser into a 20.4&#xa0;fs laser pulse. Unlike the optical components in Chirped-Pulse Amplification (CPA), plasma is resistant to damage from intense laser exposure. These results have the potential to be a scheme for generating high intensity short laser pulses.</p>

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Cosh-Gaussian laser pulse compression by plasma-based nonlinearity for high-intensity relativistic lasers

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Sintu Kumar,
  • Pratibha Jaiswal

摘要

A concept for the generation of short, relativistically strong femtosecond pulse is proposed. Self-compression, group velocity dispersion (GVD) and self-phase modulation (SPM), are given particular attention in the study. The interaction of Cosh-Gaussian laser with plasma, causes a change in the phase of the laser pulse and alters the plasma’s refractive index, leading to laser pulse spectral broadening. It is worth noticing that, the laser in plasma shows opposite GVD compared to other media like solid. This exclusive behavior permits laser pulse to experience dispersion compensation while broadening the spectrum, eventually leading to self-compression. The numerical model, performed using the paraxial approach demonstrates how these phenomena contribute to the self-compression of a 200 fs laser into a 20.4 fs laser pulse. Unlike the optical components in Chirped-Pulse Amplification (CPA), plasma is resistant to damage from intense laser exposure. These results have the potential to be a scheme for generating high intensity short laser pulses.