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Harmonic mode locking in a sliding-frequency fiber laser.

Carlo Amadeo Alonzo1, Seok H Yun

  • 1Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, BAR8, Boston, Massachusetts 02114, USA.

Optics Letters
|May 5, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a sliding-frequency mode-locked erbium fiber laser producing picosecond pulses with a 50 nm wavelength sweep. Adding an optical delay line uniformly distributes pulses, enabling harmonic mode-locking up to 1 GHz.

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Area of Science:

  • Photonics
  • Laser Physics
  • Optical Engineering

Background:

  • Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
  • Sliding-frequency mode-locking (SFM) enables wavelength sweeping, essential for applications like optical coherence tomography and spectroscopy.
  • Controlling pulse dynamics and achieving high repetition rates in SFM lasers remains a challenge.

Purpose of the Study:

  • To demonstrate a sliding-frequency mode-locked erbium fiber laser capable of generating picosecond pulses with a wide spectral sweep.
  • To investigate and mitigate the effects of optical nonlinearity that cause undesirable multipulsing and pulse bunching.
  • To achieve harmonic mode-locking at higher repetition rates using a novel cavity design.

Main Methods:

  • Utilized an erbium fiber laser cavity designed for sliding-frequency mode-locking.
  • Introduced excess optical nonlinearity to induce specific pulse dynamics.
  • Incorporated a parallel optical delay line with a path difference related to the cavity length.
  • Analyzed pulse bunching, repetition rate, and wavelength sweep characteristics.

Main Results:

  • Successfully generated 20 picosecond (ps) pulses with a 50 nm center wavelength sweep.
  • Observed multipulsing due to cavity nonlinearity, leading to pulse bunching below 3 nanoseconds (ns) at 25 MHz.
  • Achieved uniform pulse distribution and harmonic sliding-frequency mode-locking up to 1 GHz by adding the optical delay line.

Conclusions:

  • Cavity nonlinearity is a critical design parameter influencing pulse behavior in picosecond wavelength-swept lasers.
  • The addition of a rationally fractioned optical delay line effectively controls pulse distribution and enables higher harmonic mode-locking.
  • This work provides a pathway for developing advanced picosecond wavelength-swept lasers with improved repetition rates.