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Related Experiment Video

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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Frequency-modulated, tunable, semiconductor-optical-amplifier-based fiber ring laser for linewidth and line shape

Simon Lambert Girard1, Hongxin Chen, Gregory W Schinn

  • 1Centre d'Optique, Photonique et Laser, University Laval, Quebec, Canada. simon.lambart-girard.1@ulaval.ca

Optics Letters
|August 19, 2008
PubMed
Summary

Researchers can actively control fiber ring laser linewidth and shape using frequency modulation. This technique allows adjustable linewidths from submegahertz to gigahertz, enabling tailored laser output for various applications.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Semiconductor Lasers

Background:

  • Fiber ring lasers offer tunable output but controlling linewidth and shape is challenging.
  • Semiconductor optical amplifiers are key components in these tunable lasers.
  • Active control of laser parameters is crucial for advanced applications.

Purpose of the Study:

  • To demonstrate active adjustment of linewidth and line shape in a fiber ring laser.
  • To investigate the effect of intracavity frequency modulation on laser output.
  • To develop a method for synthesizing specific laser line shapes.

Main Methods:

  • Employing an intracavity phase modulator driven near the cavity axial-mode spacing.
  • Utilizing frequency modulation to achieve constant-amplitude laser output with varying instantaneous frequency.
  • Modifying the modulating waveform to synthesize desired line shapes.

Main Results:

  • Achieved active control over laser linewidth, adjustable from submegahertz to over 5 GHz.
  • Demonstrated linewidth variation proportional to the inverse of frequency detuning.
  • Synthesized a near-Gaussian output line shape by selecting an appropriate modulating waveform.

Conclusions:

  • Intracavity frequency modulation provides effective control over fiber ring laser linewidth and line shape.
  • The developed method allows for tunable linewidths and customizable output profiles.
  • Experimental results align well with theoretical models, validating the approach.