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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Controlling light propagation speed is crucial for optical signal processing.
    • Photorefractive materials offer unique nonlinear optical properties for light manipulation.

    Purpose of the Study:

    • To experimentally demonstrate ultralow effective group velocity of light pulses.
    • To investigate controllable time delays in a nonlinear optical system.
    • To achieve a large delay-bandwidth product in a slow light system.

    Main Methods:

    • Utilized a two-wave mixing process in a tin sulfide (Sn2P2S6:Te) crystal.
    • Employed nonlinear photorefractive gain to control light pulse delay.
    • Varied input pulse duration and optimized nonlinearity strength.

    Main Results:

    • Observed an ultralow effective group velocity of 0.9 cm/s for light pulses.
    • Achieved controllable time delays by adjusting photorefractive gain and pulse duration.
    • Attained a maximum fractional delay of 0.79 for 100 ms pulse durations.

    Conclusions:

    • The demonstrated photorefractive slow light system effectively combines low group velocity with a large delay-bandwidth product.
    • The system supports pulse durations spanning three orders of magnitude.
    • This work advances the development of advanced optical delay lines and signal processing.