Effect of beam wander on the scintillation characterization for multiple beams

Wu-ming Wu; Quan Sun; Guang-sen Ren; Yu Ning; Rui Du; Yi Wu

doi:10.1117/12.2031738

21 August 2013 Effect of beam wander on the scintillation characterization for multiple beams

Wu-ming Wu, Quan Sun, Guang-sen Ren, Yu Ning, Rui Du, Yi Wu

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 890609 (2013) https://doi.org/10.1117/12.2031738
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

An 4km optical link was established to examine the effect of beam wander on the scintillation characterization for multiple focus beams. Multiple beams that sample different portions of the atmosphere reduce the scintillation if the atmospheric turbulence each beam traverses is independent. How much the beam wander affects scintillation is determined by the number of the beams and the size of the beam wander variance. The number of mutually incoherent beams was 1, 3 or 6. Individual laser was launched from a separate region of the transmitter and focused on the flat screen with the horizontal distance of 4km by 350mm telescope. We recorded the illuminated flat screen with a CCD camera operating at 1kHz. We calculated the scintillation index of the illuminated area with the size of 8x8cm on the condition of untracked and tracked beams. A tracked beam generally refers to the situation in which the beam is tilt-corrected. However, There was no tilt-corrected in the experiment. Instead, the rms beam centroid of the area was aligned with the optical axis at each frame. Experimental results show that the scintillation index in tracked beam was larger than in the untracked beam case when the size of the Rytov variance σ²_R is the same for one beam case, but for three and six beams, the scintillation values are almost. It is the reason that the root mean square variance of wander angle decreases as the number of beams increases. So the effect of beam wander is not evident for three and six beams. And increasing the number of beams on the condition of untracked and tracked cases does reduce the scintillation index as predicted.

Citation Download Citation

Wu-ming Wu, Quan Sun, Guang-sen Ren, Yu Ning, Rui Du, and Yi Wu "Effect of beam wander on the scintillation characterization for multiple beams", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890609 (21 August 2013); https://doi.org/10.1117/12.2031738

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KEYWORDS

Scintillation

Atmospheric optics

Telescopes

Atmospheric scintillation

CCD cameras

Atmospheric sciences

Cameras

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