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Bistability in multiphoton ionization with recombination.

H C Baker1, L Armstrong

  • 1Department of Physics, Berea College, Berea, Kentucky 40404, USA.

Optics Letters
|August 25, 2009
PubMed
Summary
This summary is machine-generated.

Multiphoton ionization exhibits bistability due to recombination, showing abrupt ionization changes at critical laser intensities. Dispersion effects on this ionization bistability are also examined.

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Area of Science:

  • Atomic and Molecular Physics
  • Laser Physics
  • Plasma Physics

Background:

  • Multiphoton ionization is a fundamental process where atoms or molecules absorb multiple photons to ionize.
  • Bistability in physical systems refers to the existence of two stable states for a given set of parameters.
  • Recombination processes are crucial in determining the steady-state population of ionized species.

Purpose of the Study:

  • Investigate the steady-state degree of ionization under bistable conditions driven by multiphoton ionization.
  • Analyze the role of recombination in establishing bistability in the ionization degree.
  • Examine the influence of dispersion on the observed bistability characteristics.

Main Methods:

  • Theoretical investigation of the steady-state ionization degree.
  • Modeling the interplay between multiphoton ionization and recombination.
  • Analysis of the dependence on incident laser intensity and dispersion parameters.

Main Results:

  • Demonstrated that recombination induces a bistable steady state in the degree of ionization.
  • Identified critical laser intensities (I(i1) and I(i2)) for abrupt increases and decreases in ionization.
  • Showcased the impact of dispersion on the thresholds and range of bistability.

Conclusions:

  • Recombination is a key factor enabling bistability in multiphoton ionization.
  • The system exhibits distinct switching behaviors based on laser intensity, influenced by dispersion.
  • Understanding these bistable phenomena is vital for controlling ionization in laser-matter interactions.