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Related Experiment Video

Updated: Jun 26, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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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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Single-mode Er-doped fiber random laser with distributed Bragg grating feedback.

N Lizárraga1, N P Puente, E I Chaikina

  • 1División de Física Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Km. 107 carretera Tijuana-Ensenada, Ensenada, B. C., 22860, México.

Optics Express
|January 23, 2009
PubMed
Summary

This study demonstrates a novel one-dimensional random laser using an Er/Ge co-doped fiber with random Bragg gratings. The random laser exhibits threshold behavior and multiple spectral modes, paving the way for new photonic devices.

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Area of Science:

  • Photonics and Laser Technology
  • Materials Science and Engineering

Background:

  • Random lasers offer unique spectral properties due to disordered structures.
  • Erbium/Germanium co-doped fibers provide a gain medium for 1550 nm emission.
  • Bragg gratings enable resonant cavity formation in optical fibers.

Purpose of the Study:

  • To implement and characterize a one-dimensional random laser.
  • To investigate the effect of random Bragg grating configurations on laser performance.
  • To analyze the spectral characteristics and threshold behavior of the random laser.

Main Methods:

  • Fabrication of a one-dimensional random laser using Er/Ge co-doped single-mode fiber.
  • Introduction of randomly spaced Bragg gratings to form a complex cavity.

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Last Updated: Jun 26, 2026

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  • Optical pumping at 980 nm and spectral analysis of laser emission.
  • Numerical simulations using the transfer matrix method for light propagation.

    • Main Results:

    • Successful implementation of a random laser with high-quality factor resonances around 1535.5 nm.
    • Observed typical laser threshold behavior as a function of pump power.
    • Experimental emission spectra showed multiple competing spectral modes.
    • Qualitative agreement between experimental results and numerical simulations.

    Conclusions:

    • The developed random laser demonstrates tunable spectral properties and threshold behavior.
    • Randomly spaced Bragg gratings in doped fibers are effective for creating complex laser cavities.
    • This work contributes to the understanding and development of novel random laser systems.