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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Passive harmonic mode locking by mode selection in Fabry-Perot diode lasers with patterned effective index.

David Bitauld1, Simon Osborne, Stephen O'Brien

  • 1Tyndall National Institute, University College, Lee Maltings, Cork, Ireland.

Optics Letters
|July 3, 2010
PubMed
Summary

We achieved passive harmonic mode locking in a quantum-well laser diode, generating a 100 GHz pulse repetition rate. This method uses nonperiodic patterning for spectral filtering, yielding near-transform-limited 2 ps pulses.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Nonlinear Optics

Background:

  • Quantum-well laser diodes support discrete Fabry-Perot modes.
  • Mode locking is crucial for generating ultrashort optical pulses.
  • Controlling mode spacing is key for high-repetition-rate lasers.

Purpose of the Study:

  • To demonstrate passive harmonic mode locking in a quantum-well laser diode.
  • To achieve spectral filtering using nonperiodic cavity patterning.
  • To obtain a high-repetition-rate, near-transform-limited pulsed output.

Main Methods:

  • Fabrication of a quantum-well laser diode with engineered effective index.
  • Implementation of nonperiodic patterning for spectral filtering.
  • Selection of specific Fabry-Perot modes for harmonic mode locking.

Main Results:

  • Successfully demonstrated passive harmonic mode locking.
  • Achieved spectral filtering by nonperiodic effective index patterning.
  • Obtained near-transform-limited pulses with 2 ps duration at 100 GHz repetition rate.

Conclusions:

  • Nonperiodic patterning is effective for spectral filtering in laser cavities.
  • Passive harmonic mode locking can generate high-repetition-rate optical pulses.
  • This technique offers a pathway to advanced photonic applications.