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<p>The possibility of controlling the spectrum of high harmonics in the range of 50–200 eV under the excitation of a gas jet by a pair of intense femtosecond near- (1.24 μm) and mid-infrared (4.5 μm) laser pulses has been experimentally demonstrated. It has been established that an increase in the intensity of long-wavelength radiation from ~10<sup>9</sup> to ~10<sup>12</sup> W/cm<sup>2</sup> under the peak intensity 10<sup>14</sup> W/cm<sup>2</sup> of the short-wavelength pulse leads to a transition from a discrete spectrum containing sum and difference frequencies to a quasi-continuous broadband spectrum. This transition has been explained by a change in the regime of influence of the mid-infrared field on the dynamics of the generating electron. The obtained results demonstrate the prospects for generating radiation with the quasi-continuous broadband spectrum up to the soft X-ray region when generating high harmonics by a synthesized laser field.</p>

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Broadband Transformation of the High-Order Harmonic X-Ray Spectrum in a Gas, Mediated by a Synthesized Laser Field of Intense Femtosecond Laser Pulses in the Near- and Mid-Infrared Range

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月1日

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  • B. V. Rumiantsev,
  • A. V. Pushkin,
  • P. A. Shulyndin,
  • E. A. Migal,
  • F. V. Potemkin

摘要

The possibility of controlling the spectrum of high harmonics in the range of 50–200 eV under the excitation of a gas jet by a pair of intense femtosecond near- (1.24 μm) and mid-infrared (4.5 μm) laser pulses has been experimentally demonstrated. It has been established that an increase in the intensity of long-wavelength radiation from ~109 to ~1012 W/cm2 under the peak intensity 1014 W/cm2 of the short-wavelength pulse leads to a transition from a discrete spectrum containing sum and difference frequencies to a quasi-continuous broadband spectrum. This transition has been explained by a change in the regime of influence of the mid-infrared field on the dynamics of the generating electron. The obtained results demonstrate the prospects for generating radiation with the quasi-continuous broadband spectrum up to the soft X-ray region when generating high harmonics by a synthesized laser field.