Angle-of-arrival variance's dependence on the aperture size for indoor convective turbulence

DAMIÁN GULICH, GUSTAVO FUNES, LUCIANO ZUNINO, DARÍO G. PÉREZ AND MARIO GARAVAGLIA

OPTICS COMMUNICATIONS

Elsevier

Lugar: Amsterdam, The Netherlands; Año: 2007 vol. 277 p. 241 - 246

0030-4018

We analyze the angle-of-arrival variance of an expanded and collimated laser beam once it has traveled through an indoor convective turbulence. A continuous position detector is set at the focus of a lens collecting the laser beam. The effect of the different turbulent scales, between the inner and the outer scales, is studied by changing the diameter of a circular pupil before the collector lens. The experimental optical setup follows the design introduced by Masciadri and Vernin [Appl. Opt., Vol. 36 (6), pp. 1320-1327, February 1997]. Tilt data measurements are studied using the fractional Brownian motion model for the turbulent wave-front phase introduced in a previous paper [J. Opt. Soc. Am. A, Vol. 21 (10), pp. 1962-1969, October 2004]. The Hurst exponents associated to different strengths of turbulence are obtained from the here proposed $D^{2H-2}$ dependence.