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MEMS-tunable VCSELs using 2D high-contrast gratings.

Pengfei Qiao, Kun Li, Kevin T Cook

    Optics Letters
    |February 16, 2017
    PubMed
    Summary

    We developed a tunable, electrically pumped laser using a 2D high-contrast grating (HCG) for room-temperature 1080 nm operation. This novel device offers broadband ultrahigh reflection and single-mode output, paving the way for advanced photonic applications.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Materials Science

    Background:

    • Vertical-cavity surface-emitting lasers (VCSELs) are crucial for optical communication and sensing.
    • Achieving tunable, efficient, and compact laser sources remains a key challenge.
    • High-contrast gratings (HCGs) offer unique optical properties for laser design.

    Purpose of the Study:

    • To demonstrate the first tunable, electrically pumped, surface-emitting laser utilizing a 2D high-contrast grating (HCG).
    • To achieve room-temperature operation at 1080 nm with single-mode output.
    • To explain the underlying mechanism of broadband ultrahigh reflection in 2D HCGs.

    Main Methods:

    • Fabrication of a monolithic, two-dimensional high-contrast grating (2D HCG) VCSEL.

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  • Experimental demonstration of continuous-wave (CW) operation at room temperature.
  • Utilizing microelectromechanical system (MEMS) controlled voltage for wavelength tuning.

    • Main Results:

    • Successful room-temperature operation of a 1080 nm 2D HCG VCSEL.
    • Single-mode output power exceeding 0.68 mW under CW operation.
    • Demonstrated wavelength tunability through MEMS-actuated voltage control.

    Conclusions:

    • The 2D HCG VCSEL represents a significant advancement in tunable laser technology.
    • The developed theory accurately describes the broadband ultrahigh reflection mechanism of 2D HCGs.
    • This work enables the development of compact, tunable laser sources for diverse applications.