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Optical chirality (OC) theory is extended to nonlinear processes, linking pump light chirality to attosecond pulse generation. New OC quantities accurately describe multichromatic pump interactions for advanced chiral light-matter studies.

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Area of Science:

  • * Physics
  • * Optics
  • * Quantum Electrodynamics

Background:

  • * Optical chirality (OC) quantifies light's instantaneous chirality.
  • * OC is established in linear optics but unexplored in nonlinear processes.
  • * High-order harmonic generation and attosecond pulse production are key nonlinear phenomena.

Purpose of the Study:

  • * To investigate the role of OC in generating helically polarized high-order harmonics and attosecond pulses.
  • * To extend OC theory to nonlinear optical processes, particularly those involving multichromatic light fields.
  • * To develop new theoretical tools for understanding chiral light-matter interactions in the nonlinear regime.

Main Methods:

  • * Separation of transversal and paraxial beam OC into polarization and orbital components.
  • * Analysis of OC in attosecond pulse generation from quasimonochromatic and multichromatic pumps.
  • * Proposal and validation of non-instantaneous and time-scale-weighted OC quantities.

Main Results:

  • * Polarization-associated OC of attosecond pulses approximates the pump's OC in the quasimonochromatic case.
  • * Discrepancy observed for multichromatic pumps due to rapid temporal variations in polarization OC.
  • * New OC quantities successfully link multichromatic pump chirality to generated attosecond pulse chirality.

Conclusions:

  • * Extended OC theory provides a framework for nonlinear chiral light-matter interactions.
  • * The proposed quantities are crucial for understanding attosecond pulse generation with complex light fields.
  • * This work enables novel applications, such as generating tunable elliptical attosecond pulses using tricircular pumps.