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Anastasios D Koulouklidis1,2, Dimitris G Papazoglou1,2, Vladimir Yu Fedorov3,4

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Abruptly autofocusing ring-Airy beams generate harmonics that retain the fundamental beam's phase. This phase memory enables harmonics to exhibit abrupt autofocusing, with potential applications in strong field science.

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Area of Science:

  • Nonlinear optics
  • Strong field physics
  • Beam propagation

Background:

  • Abruptly autofocusing beams offer unique propagation dynamics.
  • Ring-Airy beams are a class of such beams with specific intensity profiles.
  • Harmonic generation is a key process in nonlinear optics.

Purpose of the Study:

  • To investigate the phase properties of harmonics generated from abruptly autofocusing ring-Airy beams.
  • To explore the propagation dynamics of these harmonics.
  • To assess the potential applications in strong field science.

Main Methods:

  • Theoretical modeling of beam propagation and harmonic generation.
  • Experimental generation and characterization of ring-Airy beams and their harmonics.
  • Numerical simulations to support theoretical and experimental findings.

Main Results:

  • Harmonics from abruptly autofocusing ring-Airy beams preserve the phase of the fundamental beam.
  • This phase preservation results in abrupt autofocusing behavior for the harmonics.
  • Under specific conditions, harmonic foci spatially coincide with the fundamental beam's focus.

Conclusions:

  • The "phase memory" phenomenon is demonstrated in abruptly autofocusing ring-Airy beam harmonics.
  • This property allows for controlled autofocusing of higher-order harmonic frequencies.
  • Findings pave the way for novel applications in strong field science using these beams.