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    Researchers experimentally generated optical turbulence using a Rayleigh-Bénard (RB) convection water tank. They quantified turbulence properties, finding intensity fluctuations follow specific distributions and confirming a relationship between turbulence strength and temperature gradient.

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    Area of Science:

    • Physics
    • Fluid Dynamics
    • Optics

    Background:

    • Optical turbulence is challenging to study experimentally due to difficulties in controlling laboratory conditions.
    • Rayleigh-Bénard (RB) convection in water tanks offers a controllable method for generating optical turbulence via temperature gradients.
    • Quantifying optical turbulence properties is crucial for applications in imaging, sensing, and optical communications.

    Purpose of the Study:

    • To experimentally characterize optical turbulence generated in an RB convection water tank.
    • To quantify intensity fluctuation distributions, scintillation, and the refractive index structure constant (Cn2).
    • To compare Cn2 estimates derived from different measurement planes and validate theoretical predictions.

    Main Methods:

    • Propagating a Gaussian beam through a RB convection water tank.
    • Measuring beam intensity at the receiver's pupil and focal plane.
    • Calculating intensity fluctuation distribution, scintillation index, and angle of arrival fluctuations.
    • Estimating the refractive index structure constant (Cn2) from measurements.

    Main Results:

    • Intensity fluctuations followed gamma-gamma and log-normal probability density functions.
    • The refractive index structure constant (Cn2) exhibited a power-law relationship with the temperature gradient (Cn2∼ΔT^(4/3)).
    • Cn2 estimates from pupil and focal plane measurements showed consistent trends but varied in magnitude.

    Conclusions:

    • RB convection is a viable method for generating controllable optical turbulence in a laboratory setting.
    • The study provides quantitative data on optical turbulence characteristics relevant to various applications.
    • Experimental results support theoretical predictions for Cn2 dependence on temperature gradients in RB convection.