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Related Experiment Video

Updated: Dec 10, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Spectral dynamics on saturable absorber in mode-locking with time stretch spectroscopy.

Masayuki Suzuki1, Ozdal Boyraz2, Hossein Asghari3

  • 1Faculty of Science and Engineering, Doshisha University, 3 Tatara-Miyakodani, Kyotanabe, Kyoto, 610-0394, Japan. masuzuki@mail.doshisha.ac.jp.

Scientific Reports
|September 4, 2020
PubMed
Summary

We used time-stretch dispersive Fourier transformation (TS-DFT) to observe ultrafast laser pulse formation. This technique revealed multiple pulses and soliton molecules during the build-up to stable mode-locking in Yb fiber lasers.

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Area of Science:

  • Ultrafast optics
  • Laser physics
  • Nonlinear dynamics

Background:

  • Mode-locked lasers generate ultrashort pulses for diverse scientific applications.
  • Semiconductor saturable absorbers are crucial for achieving stable, long-term, alignment-free mode-locking.
  • Conventional spectrometers cannot capture the complex, rapid spectral dynamics during mode-locking build-up.

Purpose of the Study:

  • To experimentally demonstrate the real-time spectral evolution during femtosecond pulse build-up.
  • To investigate the transient dynamics leading to stable mode-locking in a fiber laser.
  • To utilize time-stretch dispersive Fourier transformation (TS-DFT) for high-speed spectral measurements.

Main Methods:

  • Employed a homemade passive mode-locked Yb fiber laser with a semiconductor saturable absorber mirror.
  • Utilized time-stretch dispersive Fourier transformation (TS-DFT) for successive single-shot spectral measurements.
  • Captured 700 consecutive spectra within a 17 µs time window to resolve transient dynamics.

Main Results:

  • Observed real-time spectral evolution of femtosecond pulse build-up.
  • Detected oscillating or shifting fringe patterns in spectra before stable mode-locking, indicating multiple pulses.
  • Identified the presence of multiple pulses, including soliton molecules with varying relative phases.

Conclusions:

  • The study provides novel insights into the birth of ultrafast mode-locked laser pulses.
  • Transient dynamics, including multiple pulse formation, are linked to the fast relaxation time of saturable absorption.
  • The findings enhance understanding of the transition to stable single-pulse operation in ultrafast lasers.