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Microscopic approach to second harmonic generation in quantum cascade lasers.

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    This study models second harmonic generation in lasers using a non-equilibrium Green's function formalism. The approach accurately predicts laser performance and second harmonic intensity compared to experimental data.

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    Area of Science:

    • Optics and Photonics
    • Quantum Electronics
    • Materials Science

    Background:

    • Second harmonic generation (SHG) is a key nonlinear optical process.
    • Accurate modeling of SHG in laser structures is crucial for device optimization.
    • Microscopical analysis provides deeper insights into nonlinear optical phenomena.

    Purpose of the Study:

    • To analyze second harmonic generation from a microscopical perspective.
    • To model the complete on-state of a laser using a specific theoretical framework.
    • To validate theoretical predictions against experimental results for SHG intensity.

    Main Methods:

    • Utilizing the non-equilibrium Green's function (NEGF) formalism.
    • Modeling the laser's on-state and higher-order current responses.
    • Integrating waveguide properties with calculated currents to determine SHG intensity.

    Main Results:

    • The NEGF formalism accurately models the laser's on-state.
    • Calculated second harmonic intensity shows good agreement with experimental data.
    • The approach allows for the assessment of simplified theoretical expressions for SHG.

    Conclusions:

    • The microscopical NEGF approach is a valid and accurate method for analyzing SHG in lasers.
    • This formalism captures essential system coherences, improving theoretical predictions.
    • The findings contribute to a better understanding and design of nonlinear optical devices.