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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Structured transverse modes governed by maximum entropy principle.

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    A diode-pumped laser emulates quantum Green functions. Lasing modes align with maximum entropy states, suggesting pump-cavity coupling influences mode formation.

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    Area of Science:

    • Quantum optics
    • Laser physics
    • Condensed matter theory

    Background:

    • Quantum Green functions describe particle behavior in quantum systems.
    • Harmonic oscillators are fundamental models in physics.
    • Birefringent lasers offer unique optical properties.

    Purpose of the Study:

    • To emulate quantum Green functions using a diode-pumped laser.
    • To investigate the relationship between lasing modes and quantum states.
    • To explore the role of pump-cavity interactions in laser dynamics.

    Main Methods:

    • Utilizing a diode-pumped Nd-doped vanadate laser with a nearly hemispherical cavity.
    • Employing the birefringent effect of the gain medium for emulation.
    • Matching theoretical calculations with far-field lasing mode patterns.
    • Applying Shannon entropy to quantify spatial entanglement.

    Main Results:

    • Accurate determination of resonant transverse frequencies up to high orders.
    • Confirmation that lasing modes correspond to maximum entropy states.
    • Demonstration of spatial entanglement in quantum Green functions.
    • Evidence of agreement between experimental and theoretical findings.

    Conclusions:

    • The diode-pumped laser successfully emulates quantum Green functions.
    • Lasing mode formation is linked to pump source and laser cavity coupling.
    • Maximum entropy states are relevant to the observed lasing modes.