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Frequency control using a complex effective reflectivity in laterally coupled semiconductor laser arrays.

G Griffel, W K Marshall, I Gravé

    Optics Letters
    |September 25, 2009
    PubMed
    Summary

    This study explores frequency selectivity in novel semiconductor laser arrays. The research found that these laser arrays exhibit strong frequency selectivity due to a periodic gain dependency on frequency.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Devices

    Background:

    • Laterally coupled semiconductor laser arrays offer potential for enhanced optical performance.
    • Understanding frequency selectivity is crucial for laser applications requiring narrow linewidths.

    Purpose of the Study:

    • To investigate the frequency selectivity of a novel multielement, multisection laterally coupled semiconductor laser array.
    • To theoretically and experimentally validate the frequency selectivity mechanisms in such devices.

    Main Methods:

    • Utilizing the round-trip method for theoretical analysis.
    • Fabricating and experimentally testing a gain-guided two-coupled-cavity semiconductor laser device.

    Main Results:

    • The study identified a strong frequency selectivity in the novel laser array structure.

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  • A periodic dependency of threshold gain on frequency was found to be the underlying mechanism.
  • Experimental results demonstrated excellent agreement with theoretical predictions.

    • Conclusions:

    • The novel multielement, multisection laterally coupled semiconductor laser array exhibits significant frequency selectivity.
    • The periodic gain-frequency dependency is a key factor enabling this selectivity.
    • The fabricated device validates the theoretical model, confirming the potential of this laser architecture.