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Tunable vector-vortex beam optical parametric oscillator.

Varun Sharma1,2, S Chaitanya Kumar3,4, A Aadhi5

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Researchers developed a new method to directly generate tunable vector-vortex beams from a laser source. This breakthrough offers versatile structured light generation across various wavelengths and timescales.

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Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Vector-vortex beams possess both phase and polarization singularities, making them valuable for diverse applications.
  • Current methods often generate these beams externally, limiting wavelength tunability.

Purpose of the Study:

  • To demonstrate a novel experimental scheme for direct generation of tunable vector-vortex beams.
  • To overcome the wavelength limitations of existing laser sources for vector-vortex beam generation.

Main Methods:

  • Utilized an optical parametric oscillator for broad wavelength versatility.
  • Employed a pair of intracavity quarter-wave plates to control beam polarization.
  • Leveraged orbital angular momentum conservation principles.

Main Results:

  • Successfully generated coherent vector-vortex beams directly from the laser source.
  • Achieved wavelength tunability for vector-vortex beams in the 964-990 nm range.
  • Demonstrated output states representable on the higher-order Poincaré sphere.

Conclusions:

  • The developed scheme provides a generic method for creating tunable structured beams.
  • This approach is adaptable for various wavelength ranges and temporal regimes (continuous-wave to ultrafast).
  • Opens new avenues for advanced optical applications requiring tailored light structures.