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High-order harmonic generation from the dressed autoionizing states.

M A Fareed1, V V Strelkov2,3, N Thiré1

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Resonant harmonics (RH) in high-order harmonic generation can create intense extreme-ultraviolet radiation. This study reveals new quantum paths involving dressed autoionizing states, enabling broadband attosecond pulse generation.

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Area of Science:

  • Quantum Optics
  • Attosecond Science
  • Extreme Ultraviolet (XUV) Radiation Generation

Background:

  • Resonant harmonics (RH) are crucial for intense, coherent extreme-ultraviolet (XUV) radiation in high-order harmonic generation (HHG).
  • Current limitations include intensity enhancement for only a single harmonic order, hindering short attosecond pulse generation.
  • The underlying mechanism of RH has lacked direct experimental validation.

Purpose of the Study:

  • To experimentally elucidate the precise quantum pathways responsible for resonant harmonic generation.
  • To investigate the role of autoionizing states (AIS) and dressed states in RH.
  • To explore new possibilities for generating intense and broadband attosecond pulses.

Main Methods:

  • Experimental demonstration of quantum paths for RH generation using tin (Sn) as the target material.
  • Analysis of harmonic emission originating from dressed autoionizing states (d-AIS).
  • Observation of satellite harmonics at ±2Ω relative to the RH, where Ω is the laser frequency.

Main Results:

  • Identified specific electron quantum paths driving RH generation.
  • Confirmed that RH generation involves not only autoionizing states but also harmonic emission from d-AIS.
  • Observed two coherent satellite harmonics flanking the RH, providing direct evidence of d-AIS involvement.

Conclusions:

  • The findings reveal a novel mechanism for RH generation involving d-AIS, offering a pathway to overcome current limitations.
  • This work opens avenues for generating intense and broadband attosecond pulses, advancing attosecond science.
  • Provides a foundation for studying ultrafast dynamics of autoionizing states.