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Tri-channel single-mode terahertz quantum cascade laser.

Tao Wang, Jun-Qi Liu, Feng-Qi Liu

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    |December 10, 2014
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    A compact terahertz quantum cascade laser array provides individually controllable emission at three wavelengths. This multiwavelength source is a prototype for terahertz wavelength division multiplexing wireless communication systems.

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    Area of Science:

    • Optoelectronics
    • Quantum Cascade Lasers
    • Terahertz Technology

    Background:

    • Terahertz (THz) technology is crucial for next-generation wireless communication.
    • Developing compact, multi-wavelength THz sources is essential for advancing THz communication systems.

    Purpose of the Study:

    • To demonstrate a novel compact THz quantum cascade laser (QCL) source capable of emitting at multiple, individually controllable wavelengths.
    • To present a prototype emission source for THz wavelength division multiplexing (WDM) wireless communication systems.

    Main Methods:

    • Fabrication of a monolithic chip integrating three tapered single-mode distributed feedback (DFB) terahertz quantum cascade lasers.
    • Characterization of the laser array for emission properties, including wavelength control and mode stability.
    • Measurement of output power at cryogenic temperatures (10 K).

    Main Results:

    • Successfully demonstrated a compact THz QCL array emitting at three distinct wavelengths: 92.6, 93.9, and 95.1 μm.
    • Confirmed longitudinal and lateral single-mode operation across the entire injection range for all array elements.
    • Achieved peak output powers of 42 mW, 73 mW, and 37 mW at 10 K for the individual lasers.

    Conclusions:

    • The developed multiwavelength THz QCL array serves as a viable prototype for THz WDM wireless communication.
    • The monolithic integration and single-mode operation highlight the potential for scalable and efficient THz communication sources.