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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Model for a pulsed terahertz quantum cascade laser under optical feedback.

Gary Agnew, Andrew Grier, Thomas Taimre

    Optics Express
    |September 9, 2016
    PubMed
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    A new model predicts terahertz quantum cascade laser (QCL) behavior under pulsed optical feedback by accounting for thermal and electronic properties. This understanding is crucial for optimizing QCLs in pulsed applications.

    Area of Science:

    • Physics
    • Quantum Electronics
    • Semiconductor Lasers

    Background:

    • Optical feedback effects in lasers can be beneficial or detrimental depending on the application.
    • Pulsed-mode semiconductor laser behavior under optical feedback is influenced by electronic, thermal, and external cavity characteristics.

    Purpose of the Study:

    • To introduce a detailed model for predicting the behavior of terahertz frequency quantum cascade lasers (QCLs) under pulsed optical feedback.
    • To illustrate the model's application in various pulsed operation scenarios.

    Main Methods:

    • Development of a detailed model incorporating laser-specific thermal and electronic characteristics.
    • Simulation of exemplar bound-to-continuum terahertz frequency quantum cascade laser (QCL) under pulsed operation with optical feedback.

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    Main Results:

    • Demonstrated significant interplay between electro-optical, thermal, and feedback phenomena in QCLs.
    • Highlighted the critical role of this interplay in understanding pulsed QCL behavior.
    • Identified thermal modulation via low duty cycle pulsed operation as a potential alternative to adiabatic modulation for interferometric QCL applications.

    Conclusions:

    • The developed model provides crucial insights into the complex behavior of QCLs under pulsed optical feedback.
    • Understanding the interplay of thermal, electronic, and feedback effects is key for designing and optimizing QCLs for pulsed applications.
    • Low duty cycle pulsed operation offers a promising alternative for thermal modulation in QCL interferometric applications.