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Low-frequency pulsations in class-B solid-state lasers with delayed feedback.

D Pieroux, Paul Mandel

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
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    We observed new low-frequency pulsations in solid-state lasers with delayed feedback. These pulsations have longer periods than the feedback delay or relaxation oscillation period, linking them to semiconductor laser fluctuations.

    Area of Science:

    • * Physics
    • * Optics
    • * Laser Physics

    Background:

    • * Class-B lasers exhibit complex dynamics under external influences.
    • * Delayed optical feedback is a known factor in laser instability.
    • * Low-frequency fluctuations (LFFs) are observed in various laser systems.

    Purpose of the Study:

    • * To numerically observe and characterize short-duration, low-frequency pulsations in class-B solid-state lasers.
    • * To investigate the relationship between these pulsations and system parameters like feedback delay.
    • * To establish a connection between these phenomena and LFFs in other laser types.

    Main Methods:

    • * Numerical simulations of class-B solid-state laser dynamics.
    • * Analysis of time-series data to identify pulsation periods and characteristics.

    Related Experiment Videos

  • * Comparison of observed pulsation periods with feedback delay and relaxation oscillation periods.

    • Main Results:

    • * Observation of distinct short-duration, low-frequency pulsations.
    • * Pulsation periods significantly exceed both feedback delay and intrinsic relaxation oscillation periods.
    • * A clear correlation was found between these pulsations and LFFs in semiconductor lasers.

    Conclusions:

    • * Delayed feedback in class-B solid-state lasers can induce novel low-frequency pulsations.
    • * The observed pulsations are a distinct phenomenon, not directly explained by feedback delay or relaxation oscillations alone.
    • * This finding suggests a potential unifying mechanism for low-frequency dynamics across different laser types.