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Topological modes in a laser cavity through exceptional state transfer.

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Area of Science:

  • Optics and Photonics
  • Quantum Physics
  • Materials Science

Background:

  • Laser modes typically maintain a self-similar transverse spatial profile within the cavity.
  • Controlling light emission characteristics is crucial for diverse scientific and technological applications.

Purpose of the Study:

  • To demonstrate a method for shaping spatially evolving laser modes.
  • To achieve laser modes that settle into bi-orthogonal states at cavity facets.

Main Methods:

  • Designing a laser cavity structure to encircle a non-Hermitian exceptional point.
  • Ensuring the lasing mode avoids non-adiabatic jumps during its evolution.

Main Results:

  • Successfully shaped a spatially evolving laser mode.
  • Demonstrated faithful settling into bi-orthogonal states at cavity facets.
  • Linked state transfer to the topology of Riemann surfaces near exceptional points.

Conclusions:

  • The developed approach enables versatile mode-selective active devices.
  • Highlights the topological properties of exceptional points in laser systems.