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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Unidirectional spectral singularity lasing in a defective atomic lattice.

Chen Peng, Xinfu Zheng, Duanfu Chen

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate a novel method for tunable unidirectional reflection lasing (URL) using a defective atomic lattice. This approach achieves nonreciprocity and lasing in a single system, boosting optical information transmission efficiency.

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    Area of Science:

    • Quantum Optics
    • Condensed Matter Physics

    Background:

    • Unidirectional reflection lasing (URL) is crucial for optical devices.
    • Existing methods often require complex resonant cavities.

    Purpose of the Study:

    • To propose an efficient scheme for mode-tunable URL.
    • To achieve nonreciprocity and lasing in a single integrated system.

    Main Methods:

    • Utilizing a coherent gain atomic system to amplify probe fields.
    • Designing a one-dimensional (1D) defective atomic lattice for distributed feedback.
    • Engineering a non-Hermitian degenerate spectral singularity (NHDSS).

    Main Results:

    • Achieved mode-tunable URL without a resonant cavity.
    • Demonstrated URL characterized by NHDSS, dependent on probe susceptibility and Bragg condition.
    • Showcased tunability via external driving fields and lattice structure.

    Conclusions:

    • The proposed scheme is experimentally feasible.
    • Enables efficient optical information transmission and integration of active photonic devices.
    • Offers a novel approach to nonreciprocal light manipulation.