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    We demonstrated coupled laser cavities using self-imaging interference in multimode waveguides. This method enhances mode selectivity, enabling tunable lasers with high side-mode suppression and a wide tuning range.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Waveguide Technology

    Background:

    • Coupled laser cavities are fundamental for advanced laser systems.
    • Achieving high mode selectivity and tunability is crucial for laser performance.
    • Multimode waveguides offer potential for compact and integrated photonic devices.

    Purpose of the Study:

    • To experimentally demonstrate coupled laser cavities using self-imaging interference.
    • To optimize coupling through analysis of phase-delayed signals and splitter characteristics.
    • To fabricate and characterize a tunable laser based on this coupled cavity system.

    Main Methods:

    • Utilizing self-imaging interference in a multimode waveguide to couple two laser cavities.
    • Optimizing the coupling element by analyzing complex transfer coefficients derived from phase-delayed signals at a 3x3 splitter.
    • Fabricating a tunable laser incorporating the optimized coupled cavity design.

    Main Results:

    • Successful experimental demonstration of coupled laser cavities.
    • Achieved a side-mode suppression ratio (SMSR) of up to 40 dB.
    • Demonstrated a laser tuning range of 6.5 nm with milliwatt output power.

    Conclusions:

    • Self-imaging interference provides an effective method for creating coupled laser cavities.
    • The optimized coupling enhances mode selectivity, leading to improved laser performance.
    • The demonstrated tunable laser is compatible with standard fabrication processes.