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Passive coherent combination of a diode laser array with 35 elements.

Christopher J Corcoran, Frederic Durville

    Optics Express
    |April 11, 2014
    PubMed
    Summary

    A Self-Fourier cavity enabled a 35-element diode laser array to operate coherently. Regenerative feedback improved passive phasing, overcoming limitations predicted by cold cavity theories for larger laser arrays.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Laser Array Coherence

    Background:

    • Monolithic diode laser arrays are crucial for high-power applications.
    • Achieving coherent operation in large laser arrays is challenging due to phasing issues.
    • Previous theories predicted poor phasing for arrays exceeding approximately 10 elements.

    Purpose of the Study:

    • To demonstrate coherent operation of a 35-element monolithic diode laser array.
    • To investigate the role of a Self-Fourier cavity and regenerative feedback in passive phasing.
    • To challenge existing cold cavity theories regarding large laser array performance.

    Main Methods:

    • Utilized a Self-Fourier cavity to operate a 35-element monolithic diode laser array.
    • Analyzed the far-field interference pattern to measure array coherence.

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  • Compared experimental results with theoretical predictions for passively coupled laser elements.

    • Main Results:

    • Achieved a coherence of 0.57 with all 35 elements operating.
    • Observed near-constant coherence for arrays with more than 15 elements.
    • Results align with theoretical predictions of 0.65 coherence for large passively coupled arrays.

    Conclusions:

    • Regenerative feedback effectively enhances passive phasing in coherent laser arrays.
    • The Self-Fourier cavity approach circumvents limitations of cold cavity theories for large arrays.
    • Demonstrated the feasibility of achieving good phasing properties in large monolithic diode laser arrays.