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Mid-IR optical amplification and detection using quantum cascade lasers.

Dingkai Guo, Xing Chen, Liwei Cheng

    Optics Express
    |February 12, 2014
    PubMed
    Summary

    Mid-infrared quantum cascade lasers (QCLs) show tunable amplification and detection capabilities. This breakthrough enables integrated mid-IR photonic devices using a single laser material.

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    Area of Science:

    • Optoelectronics
    • Quantum Cascade Lasers
    • Mid-Infrared Photonics

    Background:

    • Quantum cascade lasers (QCLs) are semiconductor devices emitting in the mid-infrared (mid-IR) spectrum.
    • Mid-IR applications require efficient amplification and detection components.

    Purpose of the Study:

    • To investigate the amplification and detection characteristics of mid-infrared quantum cascade lasers (QCLs).
    • To explore the potential of QCLs as tunable filters and integrated photonic components.

    Main Methods:

    • Studied QCLs biased slightly below their lasing threshold.
    • Measured optical and electrical gain.
    • Evaluated the QCL amplifier's bandwidth tunability and gain peak.

    Main Results:

    • Demonstrated over 11dB optical gain and 28dB electrical gain at specified wavelengths.
    • The QCL amplifier exhibited adjustable bandwidth and a tunable gain peak.
    • The QCL functioned as both an amplifier and a detector during electrical gain measurements.

    Conclusions:

    • Mid-infrared amplification and detection can be achieved using the same QCL material.
    • Intersubband gain materials are promising for mid-IR photonic integration.