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Updated: Jun 27, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Ultrafast optical Stark mode-locked semiconductor laser.

Keith G Wilcox1, Zakaria Mihoubi, G J Daniell

  • 1School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK. K.G.Wilcox@dundee.ac.uk

Optics Letters
|November 28, 2008
PubMed
Summary

Researchers generated 260 femtosecond (fs) transform-limited pulses using an optical Stark passively mode-locked semiconductor disk laser. This advancement in ultrafast laser technology utilizes a novel saturable absorber mirror and gain structure.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Ultrafast Science

Background:

  • Mode-locked semiconductor lasers are crucial for generating ultrashort optical pulses.
  • Achieving transform-limited pulses directly from semiconductor lasers remains a challenge.
  • Optical Stark effect offers a potential mechanism for pulse shaping in lasers.

Purpose of the Study:

  • To demonstrate direct generation of transform-limited pulses from a semiconductor disk laser.
  • To investigate the role of the optical Stark effect in pulse formation.
  • To achieve high repetition rates for ultrafast laser applications.

Main Methods:

  • Utilized a passively mode-locked semiconductor disk laser.
  • Incorporated a surface recombination semiconductor saturable absorber mirror.
  • Employed a step-index gain structure.
  • Performed numerical propagation modeling of the optical Stark effect.

Main Results:

  • Successfully generated 260 femtosecond (fs) transform-limited pulses.
  • Achieved a 1 GHz repetition rate.
  • Confirmed the optical Stark effect's role in pulse formation through modeling.

Conclusions:

  • Direct generation of transform-limited pulses is feasible with optical Stark passively mode-locked semiconductor disk lasers.
  • The demonstrated laser design offers a compact and efficient source for ultrafast applications.
  • Numerical modeling validates the physical mechanism responsible for pulse shaping.