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Solgel grating waveguides for distributed Bragg reflector lasers.

M A Fardad, H Luo, Y Beregovski

    Optics Letters
    |December 12, 2007
    PubMed
    Summary
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    New aluminosilicate solgel grating waveguides and Bragg reflectors enable efficient external-cavity distributed Bragg reflector (DBR) lasers. This research demonstrates low-loss waveguides and high-reflectivity gratings for improved laser performance.

    Area of Science:

    • Materials Science
    • Optoelectronics
    • Photonics

    Background:

    • External-cavity lasers require efficient feedback mechanisms.
    • Solgel processing offers versatile fabrication of optical components.
    • Aluminosilicate materials are suitable for optical waveguide applications.

    Purpose of the Study:

    • To demonstrate solgel grating waveguides for external-cavity distributed Bragg reflector (DBR) lasers.
    • To develop a novel aluminosilicate material for single-mode waveguides and Bragg reflectors.
    • To characterize the performance of these components in laser fabrication.

    Main Methods:

    • Fabrication of single-mode waveguides using a new aluminosilicate solgel composition.
    • Fabrication of Bragg reflectors with the developed material.

    Related Experiment Videos

  • Measurement of waveguide loss at 1550 nm.
  • Characterization of Bragg reflector filtering properties near 1530 nm.
  • Integration of Bragg reflectors as feedback resonators in DBR lasers.

    • Main Results:

    • Achieved average waveguide loss of <0.2 dB/cm at 1550 nm.
    • Demonstrated Bragg reflectors with >97% filtering at ~1530 nm and ~0.6 nm bandwidth.
    • Successfully fabricated DBR lasers utilizing the Bragg reflectors.
    • Observed single-mode lasing with side-mode suppression >25 dB.

    Conclusions:

    • The developed aluminosilicate solgel material is effective for fabricating high-performance grating waveguides and Bragg reflectors.
    • These components are suitable for the construction of efficient external-cavity DBR lasers.
    • The demonstrated low loss and high reflectivity contribute to improved laser performance, including excellent side-mode suppression.