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Area of Science:

  • Nonlinear Optics
  • Waveguide Optics
  • Photonics

Background:

  • Controlling complex light waves, especially speckled beams with uncertain structures, is challenging.
  • Speckled light beams possess inherently fuzzy intensity and phase properties, complicating manipulation.

Purpose of the Study:

  • To demonstrate manipulation of a weak speckled second-harmonic signal using a co-propagating fundamental pump wave in a multimode fiber.
  • To investigate the optically induced mode conversion mechanism for controlling light properties.

Main Methods:

  • Utilizing a conservative interaction between a high-power fundamental pump wave and a weak second-harmonic signal in a graded-index fiber.
  • Modulating the pump's power and modal distribution to influence the signal's spatial quality.

Main Results:

  • Demonstrated enhancement or degradation of the signal's spatial quality by adjusting pump parameters.
  • Observed optically induced mode conversion controlled by the pump beam shape.
  • Experimentally controlled Raman Stokes cascade using the second harmonic beam and fundamental mode power distribution.

Conclusions:

  • The study presents a novel method for light-by-light control in nonlinear multimode waveguides.
  • Optically induced mode conversion offers new possibilities for manipulating complex light.
  • This technique allows for dynamic control over optical phenomena like Raman cascades.