Experiment research on uniformity of multi-beam illumination

Quan Sun; Wu-ming Wu; Yu Ning; Bai-hong Shu

doi:10.1117/12.2035140

21 August 2013 Experiment research on uniformity of multi-beam illumination

Quan Sun, Wu-ming Wu, Yu Ning, Bai-hong Shu

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 89062E (2013) https://doi.org/10.1117/12.2035140
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Adaptive optics system can work with beacon produced by illumination the dim target with laser beam. But atmospheric turbulence distributed over the entire propagation path produces intensity scintillation of the illumination laser beam. The multi-beam illumination approach can improve the intensity uniformity by adding different intensity distributions produced by separate illumination beams passing through independent atmospheric paths. A 4 km horizontal propagation path was established to examine the illumination effect with multi-beam on the target. Individual laser beams were launched from a separate region of the transmitter telescope. The far-field irradiance profile was received by target-plane and recorded with a CCD camera operating in 1k Hz placed in front of the target-plane. The uniformity of target area was determined by the number of the illuminating beams and the turbulence strength. Data were recorded with 1, 3 or 6 incoherence lasers illumination and for a range of R0 parameter. We calculated the irradiance of a 8x8 cm² area in the target-plane to characterize uniformity of illumination. Results show a good reduction in intensity variance with number of illumination beams increasing and that the uniformity of illumination on target turns to worse when the atmosphere turbulence became worse. The back backscatter from the target-plane was received by another telescope nearby the transmitter side and imaged by a CCD camera. The images of the rough reflector showed that the image resolution and the illumination effects improved with the number of illuminating beams increasing.

Citation Download Citation

Quan Sun, Wu-ming Wu, Yu Ning, and Bai-hong Shu "Experiment research on uniformity of multi-beam illumination", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89062E (21 August 2013); https://doi.org/10.1117/12.2035140

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KEYWORDS

Turbulence

Telescopes

Cameras

CCD cameras

Space telescopes

Atmospheric propagation

Scintillation

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