Ultrasound-produced rolls in nematic liquid crystals as studied through the spatial coherence of scattered light

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Abstract
The study of the spatial coherence properties of light scattered by ultrasound‐produced rolls in MBBA allows one to obtain information on the hydrodynamics of the process. In particular, the correlation length ln of refractive‐index fluctuations is first found to increase and then to decrease with the voltage V applied to the piezoelectric transducer. The onset of ’’turbulent’’ motion is clearly visible at the voltage at which dln/dV changes sign.