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Shaping the light amplified in a multimode fiber.

Raphael Florentin1, Vincent Kermene1, Joel Benoist1

  • 1XLIM Research Institute, Université de Limoges-Centre National de la Recherche Scientifique, UMR 6252, 87060 Limoges, France.

Light, Science & Applications
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Researchers can now control light amplified in multimode optical fibers by shaping the input beam

Keywords:
adaptive opticsamplificationbeam shapingcomplex mediamultimode optical fiber

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Fiber Optics

Background:

  • Light propagation in multimode optical fibers typically results in spatial and temporal randomization.
  • This randomization effect is also observed in scattering media and gain media.
  • Controlling the amplified light field in such systems has been a long-standing challenge.

Purpose of the Study:

  • To demonstrate that the wavefront of an input beam can be structured to precisely shape the light amplified by a rare-earth-doped multimode fiber.
  • To investigate the effectiveness of wavefront shaping in improving amplifier performance and robustness.

Main Methods:

  • Utilized a deformable mirror and an iterative optimization process to profile and control the input beam's wavefront.
  • Employed experimental measurements and numerical simulations to analyze the amplified light characteristics.
  • Tested the method under conditions of gain saturation and with highly multimode fibers (up to 127 modes).

Main Results:

  • Successfully shaped the amplified light into a single, sharp spot at desired locations within the fiber's output cross-section.
  • Achieved cleaning and narrowing of the amplifier's far-field pattern.
  • Demonstrated that wavefront tailoring can enhance effective gain and improve beam quality.
  • Confirmed the method's robustness under gain saturation and in highly multimode conditions.

Conclusions:

  • Wavefront shaping is a powerful technique for controlling and optimizing light amplification in multimode optical fibers.
  • This method offers precise spatial control over the amplified output, even in complex, highly multimode systems.
  • The demonstrated approach has implications for improving laser performance and developing advanced fiber-based optical systems.