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    Researchers achieved controllable multi-frequency self-injection locking using a novel setup. This method generates 1 to 4 narrow laser lines on demand, crucial for telecommunications and advanced sources.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Laser Physics

    Background:

    • Self-injection locking (SIL) is a technique to stabilize and narrow laser emission.
    • Controlling multi-frequency operation in SIL systems is challenging but essential for advanced applications.

    Purpose of the Study:

    • To demonstrate controllable multi-frequency self-injection locking regimes.
    • To investigate the conditions for simultaneous mode locking analogous to the Vernier effect.
    • To enable on-demand generation of multiple narrow laser lines.

    Main Methods:

    • Utilized an experimental setup with a reflective semiconductor optical amplifier, an external feedback mirror, and a high-Q silicon nitride (Si3N4) ring microresonator.
    • Varied the free spectral range of the external-cavity laser by adjusting its length.
    • Observed and analyzed the self-injection locking phenomena.

    Main Results:

    • Successfully realized controllable multi-frequency self-injection locking.
    • Demonstrated simultaneous locking of multiple modes, exhibiting a Vernier-like effect.
    • Achieved robust generation of 1 to 4 self-injection locked narrow lines by tuning the laser cavity length.

    Conclusions:

    • The developed experimental setup enables precise control over multi-frequency SIL.
    • The findings are significant for applications in optical telecommunications and the development of photonic-based microwave and Terahertz (THz) sources.