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Related Concept Videos

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Method Development for Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper
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Resonant-antiresonant coupled cavity VCSELs.

Kevin T Cook, Pengfei Qiao, Jipeng Qi

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    Optimizing the interface design in tunable vertical-cavity surface-emitting lasers (VCSELs) significantly enhances wavelength tuning range. An air cavity dominant design improves tuning slope and free spectral range (FSR) for broader applications.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Materials Science

    Background:

    • Tunable vertical-cavity surface-emitting lasers (VCSELs) are crucial for applications like optical coherence tomography and LIDAR.
    • The wavelength tuning range of VCSELs is highly sensitive to the cavity interface design.

    Purpose of the Study:

    • To investigate the impact of semiconductor-air cavity interface design on VCSEL performance.
    • To identify design principles for maximizing the wavelength tuning range and free spectral range (FSR).

    Main Methods:

    • Utilized a simplified model to analyze the influence of resonant and antiresonant wavelengths.
    • Confirmed model findings through full VCSEL structure simulations.
    • Demonstrated an optimized epitaxial design for an electrically pumped VCSEL.

    Main Results:

    • Identified positioning of resonant/antiresonant wavelengths as key to tuning differences.
    • An air cavity dominant design, featuring an antiresonant semiconductor cavity, enhances tuning slope and FSR.
    • Achieved a 68.38 nm tuning range centered at 1056.7 nm with continuous wave emission.

    Conclusions:

    • The epitaxial design rule for air cavity dominant VCSELs effectively increases tuning range.
    • Optimized tunable VCSELs are more suitable for advanced applications such as swept-source optical coherence tomography and frequency-modulated continuous-wave LIDAR.