Abstract
In the present communication, a systematic characterization of atmospheric turbulence simulator (ATS) based on near-index-matched optics is reported. Characteristics of the propagating laser beam in actual turbulence can be realized in the laboratory by employing such types of turbulence simulators. Such simulators are necessarily required to evaluate the performance of an adaptive optics sensor and compensator modules in the laboratory. Various strengths of atmospheric turbulence can be generated by selecting the different speeds of rotation and the diameters of the beam-interacting area of ATS. A MATLAB-based high-speed video processing method is developed and used for estimating the various turbulence parameters such as angle-of-arrival fluctuations, Fried parameter, Hurst exponent, turbulence frequencies and the scintillation index from the generated turbulence. Also, the maximum transmitted wavefront error produced by this turbulence simulator is measured by an in-house developed Shack–Hartmann wavefront sensor.
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