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<p>Wavelength-tunable coherent extreme ultraviolet sources generated via high-order harmonic generation (HHG) offer a range of unique and diverse applications. Here, we demonstrate the generation of intense, tunable, high-order harmonics from the laser-induced plasmas of molybdenum disulfide (MoS<sub>2</sub>) materials containing Ni quantum dots and Ni-carbon nanotubes. We systematically explored the spectral characteristics of high-order harmonics by exciting with a two-color pump and varying the pulse duration and delay between driving and heating pulses. The two-color pump and laser chirp variations during HHG studies allow for achieving intense resonant 26th harmonic (30.7&#xa0;nm) and tunable resonant-enhanced harmonics in the range of 31–37&#xa0;nm, respectively. We show that the harmonic yield and cutoff from the MoS<sub>2</sub> plasma produced by picosecond heating pulses are higher compared to those from the plasmas produced by nanosecond pulses.</p>

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Influence of two-color pump and laser chirp on resonant harmonic generation in MoS2 nanoflakes doped with Ni quantum dots and carbon nanotubes

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • M. Venkatesh,
  • V. V. Kim,
  • G. S. Boltaev,
  • S. R. Konda,
  • A. Srivastava,
  • T. P. Yadav,
  • J. Yu,
  • P. Svedlindh,
  • R. A. Ganeev

摘要

Wavelength-tunable coherent extreme ultraviolet sources generated via high-order harmonic generation (HHG) offer a range of unique and diverse applications. Here, we demonstrate the generation of intense, tunable, high-order harmonics from the laser-induced plasmas of molybdenum disulfide (MoS2) materials containing Ni quantum dots and Ni-carbon nanotubes. We systematically explored the spectral characteristics of high-order harmonics by exciting with a two-color pump and varying the pulse duration and delay between driving and heating pulses. The two-color pump and laser chirp variations during HHG studies allow for achieving intense resonant 26th harmonic (30.7 nm) and tunable resonant-enhanced harmonics in the range of 31–37 nm, respectively. We show that the harmonic yield and cutoff from the MoS2 plasma produced by picosecond heating pulses are higher compared to those from the plasmas produced by nanosecond pulses.