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Related Experiment Video

Updated: Apr 27, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Grating-based far field modifications of ring quantum cascade lasers.

Rolf Szedlak, Clemens Schwarzer, Tobias Zederbauer

    Optics Express
    |July 1, 2014
    PubMed
    Summary
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    We developed new distributed feedback grating designs to modify ring quantum cascade laser beams. These methods enable control over beam symmetry and polarization for 9μm emissions.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • Ring quantum cascade lasers (RQCLs) are crucial for mid-infrared applications.
    • Precise control over beam characteristics, such as far-field pattern and polarization, is essential for advanced applications.
    • Existing methods for beam shaping in RQCLs have limitations.

    Purpose of the Study:

    • To introduce novel distributed feedback (DFB) grating designs for beam modification in RQCLs.
    • To achieve a rotationally symmetric far-field emission with a central intensity maximum.
    • To generate partially radially polarized beams through controlled grating modifications.

    Main Methods:

    • Fabrication of RQCLs incorporating specifically designed DFB gratings.
    • Utilizing off-center grating placement to influence far-field emission patterns.

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  • Implementing rotated grating slits to induce polarization control.

    • Main Results:

    • Demonstrated the creation of a rotationally symmetric far-field pattern with a distinct central intensity peak.
    • Successfully generated partial radially polarized beams by rotating grating slits.
    • Confirmed the effectiveness of DFB grating designs in tailoring beam properties.

    Conclusions:

    • Novel DFB grating designs offer effective methods for beam modification in 9μm RQCLs.
    • These techniques allow for precise control over far-field symmetry and beam polarization.
    • The developed methods pave the way for advanced applications requiring tailored laser beam characteristics.