Investigation of atmospheric turbulence by narrow laser beams

Si sviluppa teoricamente e si conferma sperimentalmente un metodo per determinare i parametri della turbolenza atmosferica, basato sulle fluttuazioni relative di fasci sottili che si propagano parallelamente. Si applica il metodo a un esperimento con tre fasci laser su un percorso di 130 m e si misura anisotropia. The mutual dancing of parallel narrow laser beams is investigated both theoretically, by using a simple turbulence model, and experimentally, in order to determine the parameters of the atmospheric turbulence. Experiments were carried out with three beams from a HeNe laser over a 130 m path. Variance of the refractive index fluctuations as well as horizontal and vertical values of the turbulence scale were obtained.