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We achieved injection locking and single-frequency operation in a 19-core ytterbium-doped phosphate fiber laser (MCF). This unique laser offers potential for coherent networks and all-optical Ising machines.

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Area of Science:

  • Laser Physics
  • Fiber Optics
  • Quantum Computing

Background:

  • Multi-core fiber lasers (MCFs) offer high power potential but achieving coherent operation across cores is challenging.
  • Injection locking is a technique to synchronize laser frequencies and phases.

Purpose of the Study:

  • To demonstrate injection locking and single-frequency operation in a multi-core ytterbium-doped phosphate fiber laser (MCF).
  • To investigate uniform lasing behavior across all 19 cores.
  • To explore potential applications in coherent networks.

Main Methods:

  • Utilized a single-frequency master laser for injection locking.
  • Employed a pump beam homogenization technique for uniform core excitation.
  • Developed and used an in-house MCF laser model for verification.

Main Results:

  • Successfully achieved injection locking and single-frequency CW operation at 1030 nm across all 19 MCF cores.
  • Each core produced milliwatts of power with similar lasing thresholds.
  • Demonstrated uniform lasing behavior facilitated by pump homogenization.

Conclusions:

  • This work presents the first demonstration of injection locking in an MCF.
  • The developed MCF laser is suitable for applications requiring coherent, coupled oscillator networks.
  • Potential applications include all-optical coherent Ising machines.