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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Tunable circularly polarized lasing emission in reflection distributed feedback dye lasers.

Fei Chen1, Denis Gindre, Jean-Michel Nunzi

  • 1Laboratoire POMA, FRE CNRS 2988, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers, France.

Optics Express
|October 15, 2008
PubMed
Summary

Researchers developed a tunable circularly polarized distributed feedback (DFB) laser using a chiral photonic structure. This DFB laser

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Distributed feedback (DFB) lasers are crucial for various optical applications.
  • Achieving tunable and circularly polarized laser emission is a significant challenge in photonics.

Purpose of the Study:

  • To realize a tunable circularly polarized DFB laser.
  • To investigate chiral photonic DFB structures with tunable photonic bandgaps.

Main Methods:

  • Fabrication of a DFB laser using 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) doped methanol.
  • Generation of chiral photonic DFB structures by controlling the polarization of interfering pump beams.

Main Results:

  • A tunable circularly polarized DFB laser was successfully realized.

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  • Tunable photonic bandgaps were achieved in chiral photonic DFB structures.
  • Dual-peak lasing emission spectrum observed, indicating combined gain and refractive index modulation.

    • Conclusions:

    • The study demonstrates a novel approach for creating tunable circularly polarized DFB lasers.
    • Chiral photonic structures offer a promising route for controlling laser emission properties.
    • The observed dual-peak emission provides insight into the grating's response to gain and refractive index changes.