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Phase tuning in two-dimensional coherently coupled vertical-cavity surface-emitting laser array.

Meng Xun, Chen Xu, Yiyang Xie

    Applied Optics
    |July 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Fabrication challenges in vertical-cavity surface-emitting laser (VCSEL) arrays are overcome by phase tuning for coherent coupling. This method improves device performance and reproducibility for in-phase and out-of-phase modes.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Nanophotonics

    Background:

    • Vertical-cavity surface-emitting lasers (VCSELs) are crucial for optical communication.
    • Achieving coherent coupling in VCSEL arrays is desirable for enhanced performance.
    • Fabrication nonuniformities often hinder predictable device behavior.

    Purpose of the Study:

    • To demonstrate coherent coupling in implant-defined VCSEL arrays.
    • To investigate the impact of phase tuning on array modes and performance.
    • To improve the reproducibility and practicality of coherently coupled VCSEL arrays.

    Main Methods:

    • Fabrication of three-element VCSEL arrays using implant definition.
    • Phase tuning of individual elements to achieve coherent coupling.
    • Experimental characterization of array modes (in-phase and out-of-phase) and performance metrics.

    Main Results:

    • Coherent coupling was successfully demonstrated in VCSEL arrays via phase tuning.
    • Both in-phase and out-of-phase modes were achieved in most fabricated arrays.
    • Coherent coupling reduced threshold current and improved output power in the in-phase mode.

    Conclusions:

    • Phase tuning offers a viable method to control and achieve coherent coupling in VCSEL arrays.
    • This technique addresses fabrication nonuniformities, enhancing device predictability.
    • The demonstrated technology improves the reproducibility and practicality of coherently coupled VCSEL arrays.