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Related Experiment Videos

Dark state lasers.

Cale M Gentry, Miloš A Popović

    Optics Letters
    |August 15, 2014
    PubMed
    Summary

    We introduce a novel laser resonator using imaginary energy splitting in coupled microcavities. This design enables ultrawidely tunable, single-frequency lasers by suppressing unwanted modes.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Quantum Optics

    Background:

    • Traditional laser resonators face challenges in achieving tunable single-frequency operation.
    • External cavity configurations are common but can be complex.
    • Microcavity systems offer miniaturization and novel resonant properties.

    Purpose of the Study:

    • To propose a new laser resonator design based on imaginary energy-level splitting.
    • To enable ultrawidely tunable single-frequency lasers.
    • To offer an alternative to conventional external cavity lasers.

    Main Methods:

    • Utilizing a pair of coupled microcavities with different free-spectral ranges.
    • Employing far-field interference coupling in a shared radiation channel.
    • Designing a Vernier-like effect for selective mode suppression.

    Main Results:

    • Achieved a high-quality factor (Q) "dark state" through radiative interference coupling.
    • Demonstrated suppression of all but one longitudinal resonant mode below the lasing threshold.
    • Enabled single-frequency lasing from both homogeneously and inhomogeneously broadened gain media.

    Conclusions:

    • The proposed laser resonator concept offers a novel approach to tunable single-mode operation.
    • This design provides an alternative to complex external cavity configurations.
    • The concept is extendable to parametric-gain oscillators for tunable light sources.

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