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Related Experiment Videos

Memory in nonlinear ionization of transparent solids.

P P Rajeev1, M Gertsvolf, E Simova

  • 1National Research Council of Canada, Ottawa, Canada, K1A 0R6.

Physical Review Letters
|February 7, 2007
PubMed
Summary

Intense femtosecond laser pulses create a memory effect in bulk glasses, reducing the ionization threshold with repeated shots. This nonlinear ionization memory in dielectrics is crucial for understanding material breakdown.

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Area of Science:

  • Material Science
  • Laser Physics
  • Nonlinear Optics

Background:

  • Understanding laser-induced material modification is essential for applications in optics and electronics.
  • Dielectric breakdown under intense laser irradiation is a complex phenomenon.
  • The role of cumulative effects in multishot laser interactions is not fully understood.

Purpose of the Study:

  • To investigate the phenomenon of laser-induced ionization threshold reduction in bulk glasses.
  • To demonstrate and characterize the 'memory effect' in nonlinear ionization.
  • To explore the dependence of this effect on laser parameters like pulse energy and number of shots.

Main Methods:

  • Illumination of bulk glass samples (SiO2) with intense femtosecond laser pulses.

Related Experiment Videos

  • Measurement of the laser intensity threshold for ionization.
  • Systematic variation of the number of incident laser shots and pulse energy at a fixed spot.

    • Main Results:

    • A shot-to-shot reduction in the ionization threshold intensity was observed.
    • The threshold change exhibits positive feedback, reinforcing the ionization process.
    • The threshold reduction saturates with the number of pulses, reaching a constant ~20% decrease.
    • Saturation is achieved faster at higher pulse energies.

    Conclusions:

    • Bulk glasses exhibit a nonlinear ionization memory effect under intense femtosecond laser irradiation.
    • This memory effect, characterized by a reduced ionization threshold, is vital for understanding multishot laser-induced breakdown in dielectrics.
    • The findings have implications for laser processing, material damage thresholds, and optical device reliability.