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Ultrafast beam pattern modulation by superposition of chirped optical vortex pulses.

Asami Honda1, Keisaku Yamane2, Kohei Iwasa1

  • 1Department of Applied Physics, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, 060-8628, Japan.

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Summary

This study demonstrates ultrafast beam pattern modulation using chirped optical vortex pulses, achieving stable sub-THz frequency modulations. The technique enables precise control for applications in exciting quasi-particles and collective excitations.

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Area of Science:

  • Physics
  • Optics
  • Ultrafast Science

Background:

  • Pulse shaping techniques leverage space-time coupling for ultrashort and chirped pulses.
  • Optical vortex (OV) pulses and spatial modes are crucial in advanced optical applications.

Purpose of the Study:

  • To demonstrate ultrafast beam pattern modulation via superposition of chirped OV pulses with orthogonal spatial modes.
  • To achieve stable and robust modulations at sub-terahertz frequencies with precise phase control.

Main Methods:

  • Superposition of chirped optical vortex pulses with orthogonal spatial modes.
  • Precise phase control in spatial and time/frequency domains.
  • Analysis of Poynting vector and orbital angular momentum (OAM).

Main Results:

  • Stable sub-THz frequency beam pattern modulations, including ring-shaped optical lattices (2, 4, 6 petals) and radial patterns.
  • Demonstrated linear fringe modulation with chirped Gaussian pulses.
  • Achieved 32% energy conversion efficiency from 360 μJ input to 115 μJ output.

Conclusions:

  • The ultrafast beam pattern modulation technique is suitable for spatially coherent excitation of quasi-particles and collective charge/spin excitations.
  • While ring-shaped lattices rotate at sub-THz frequencies, the net OAM is negligible, requiring careful consideration for OAM transfer applications.