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Generation of optical vector beams using a two-mode fiber.

Nirmal K Viswanathan1, V V G Inavalli

  • 1School of Physics, University of Hyderabad, Hyderabad 500046, India. nirmalsp@uohyd.ernet.in

Optics Letters
|April 17, 2009
PubMed
Summary

Researchers generated optical vector beams using a two-mode fiber (TMF) beam converter. This TMF system efficiently transforms Gaussian beams into various structured light modes, including Hermite-Gaussian and Laguerre-Gaussian beams.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Beam Shaping

Background:

  • Optical vector beams possess complex polarization and phase structures.
  • Generating these beams often requires sophisticated optical setups.
  • Two-mode fibers offer a compact platform for mode conversion.

Purpose of the Study:

  • To demonstrate the generation of diverse optical vector beams using a two-mode fiber (TMF).
  • To explore the TMF's capability as a versatile beam converter.
  • To characterize the generated vector beams and their properties.

Main Methods:

  • Utilizing a two-mode fiber (TMF) as a beam converter.
  • Inputting a Gaussian (TEM(00)) beam with controlled polarization and launch conditions.
  • Analyzing output beams using polarization and two-beam interference techniques.

Main Results:

  • Successfully converted Gaussian beams into Hermite-Gaussian (HG(10), HG(01)) and Laguerre-Gaussian (LG(1)(0)) beams.
  • Generated beams with single helical charges and coherent combinations of vector modes.
  • Characterized electric field orientations and identified transverse/longitudinal optical vortices.

Conclusions:

  • A TMF-based beam converter is an effective method for generating various optical vector beams.
  • The output beam characteristics are controllable via input polarization, fiber length, and launch conditions.
  • This approach offers a promising route for creating structured light for diverse applications.