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Updated: May 31, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Novel technique for mode selection in a multimode fiber laser.

J M O Daniel1, J S P Chan, J W Kim

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK. jmod1g09@orc.soton.ac.uk

Optics Express
|July 1, 2011
PubMed
Summary

A new fiber laser technique uses different gratings to filter wavelengths, achieving a single-mode output beam. This method enhances beam quality (M2) from 3.3 to 1.05 in multimode fiber lasers.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Fiber Laser Technology

Background:

  • Large-mode-area fiber lasers often exhibit multimode output, limiting beam quality.
  • Achieving single-spatial-mode operation in multimode fiber lasers is crucial for high-power applications.
  • Existing mode selection techniques can be complex or inefficient.

Purpose of the Study:

  • To present a simple and effective technique for transverse mode selection in large-mode-area fiber lasers.
  • To demonstrate wavelength-dependent mode filtering using distinct spectral responses of fiber and volume Bragg gratings.
  • To achieve a single-spatial-mode output from a cladding-pumped thulium-doped fiber laser.

Main Methods:

  • Utilized a combination of fiber Bragg grating (FBG) and volume Bragg grating (VBG) as feedback elements.
  • Exploited the differing spectral characteristics of FBG and VBG for wavelength-dependent mode filtering.
  • Applied the technique to a cladding-pumped thulium-doped fiber laser with a multimode core.

Main Results:

  • Achieved a single-spatial-mode output beam with a beam propagation factor (M2) of 1.05 at 1923 nm.
  • Significantly improved beam quality compared to the free-running multimode output (M2 = 3.3).
  • Demonstrated selective excitation of higher-order modes (e.g., LP11 mode) is possible.

Conclusions:

  • The described technique offers a simple yet powerful method for transverse mode selection in multimode fiber lasers.
  • This approach enables high-quality, single-spatial-mode output, crucial for power scaling.
  • Further research into scaling this technique to higher power levels is warranted.