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Related Experiment Video

Updated: Jun 22, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Mode calculations for a terahertz quantum cascade laser.

R Sachs, H Roskos

    Optics Express
    |May 29, 2009
    PubMed
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    We analyzed terahertz quantum cascade laser modes, finding that higher doping and lower frequencies lead to tighter mode confinement. This could simplify the design of longer-wavelength devices.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Devices
    • Terahertz Technology

    Background:

    • Terahertz quantum cascade lasers (TQCLs) are crucial for various applications.
    • Understanding mode characteristics, including loss and confinement, is vital for TQCL design.
    • Current design considerations often focus on specific frequency ranges.

    Purpose of the Study:

    • To calculate the loss and confinement factors of modes in TQCL structures.
    • To investigate the influence of frequency, layer thickness, and doping on mode behavior.
    • To explore the implications for designing simplified, longer-wavelength TQCLs.

    Main Methods:

    • Utilized the Drude model to calculate free carrier and waveguide losses.
    • Employed the optical scattering matrix formalism for waveguide loss analysis.

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    Last Updated: Jun 22, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
    12:19

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

    Published on: April 4, 2017

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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  • Simulated net threshold gain across a range of frequencies (1-4 THz).

    • Main Results:

    • Mode confinement is strongly influenced by frequency and doping levels.
    • At lower frequencies and high doping, modes transition from extended to tightly confined.
    • Waveguide losses were successfully traced as a function of structural parameters.

    Conclusions:

    • The interplay between frequency and doping significantly impacts mode confinement in TQCLs.
    • The observed mode switching behavior offers opportunities for simplified device architectures.
    • These findings are particularly relevant for the development of longer-wavelength TQCLs.