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., 36(6) (1997) 1320]. Tilt data measurements are studied using the fractional Brownian motion model for the turbulent wave-front phase introduced in a previous paper [Pérez et al., J. Opt. Soc. Am. A 21(10) (2004) 1962]. The Hurst exponents associated to different strengths of turbulence are obtained from the here proposed D2H-2 dependence.
Bibliographical noteFunding Information:
DG and GF have been supported financially by a student fellowship from INNOVATEC Foundation, Argentina. LZ has been supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina). DGP has been supported by Comisión Nacional de Investigación Científica y Tecnológica (CONICYT, FONDECYT Project No. 11060512, Chile), and partially by Pontificia Universidad Católica de Valparaíso (PUCV, Project No. 123.788/2007, Chile). The authors are very grateful to the reviewers, whose comments and suggestions helped to improve an earlier version of this paper.
- Angle-of-arrival variance
- Fractional Brownian motion
- Hurst exponent
- Indoor convective turbulence