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High brightness, quantum-defect-limited conversion efficiency in cladding-pumped Raman fiber amplifiers and

John E Heebner1, Arun K Sridharan, Jay W Dawson

  • 1NIF and Photon Science Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA. heebner@llnl.gov

Optics Express
|July 20, 2010
PubMed
Summary

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This study explores cladding-pumped Raman fiber amplification for high brightness enhancement. We identify limits and propose new fiber designs to overcome parasitic effects for improved efficiency in Raman fiber amplifiers and lasers.

Area of Science:

  • Fiber optics
  • Nonlinear optics
  • Laser physics

Background:

  • Cladding-pumped Raman fiber amplification offers potential for brightness enhancement of diode pump sources.
  • Large clad-to-core diameter ratios are desirable but can lead to parasitic second-order Stokes generation.
  • Parasitic effects limit conversion efficiency and brightness enhancement in conventional fiber designs.

Purpose of the Study:

  • To theoretically investigate cladding-pumped Raman fiber amplification in a novel parameter space.
  • To determine the upper limit of brightness enhancement as a function of diameter ratio.
  • To propose strategies for overcoming existing limitations using depressed well core designs.

Main Methods:

  • Detailed theoretical investigation using a coupled-wave formalism.

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  • Analysis of parasitic second-order Stokes wavelength generation.
  • Modeling of pulsed cladding-pumped Raman fiber amplifier (CPRFA) and cw cladding-pumped Raman fiber laser (CPRFL) configurations.

    • Main Results:

    • Identified an upper limit on brightness enhancement for conventionally guided fibers based on diameter ratio.
    • Demonstrated that parasitic effects clamp achievable brightness enhancement.
    • Proposed depressed well core designs as a strategy to overcome these limitations.

    Conclusions:

    • Depressed well core designs are crucial for achieving high conversion efficiency (>60%) and brightness enhancement (>1000).
    • This research provides a pathway for advanced Raman fiber amplifiers and lasers.
    • The findings unlock unexplored parameter spaces for high-power fiber optic sources.