The dependence of the intensity PDF of a random beam propagating in the maritime atmosphere on source coherence

S. Avramov-Zamurovic, C. Nelson, R. Malek-Madani, Olga Korotkova

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Measurements of intensity statistics of a spatially pre-randomized laser beam propagating in a turbulent atmosphere along two horizontal links in close proximity to grassy ground and above a creek have been carried out in the fall of 2012. The pre-randomization of the laser beam was made by using a nematic Spatial Light Modulator placed at the laser source exit. The beams phase is randomized with Gaussian statistics with zero mean and fully controllable degree of coherence. The receiver consisted of an amplified photodetector and data acquisition device which were used to capture the beam intensity fluctuations after propagation through turbulent media. The results for the intensity Probability Density Function (PDF), the Cumulative Distribution Function and, in particular, for the scintillation index are presented for a variety of the sources states of coherence and environmental conditions. The analytical PDF is reconstructed from the statistical moments of intensity with the help of the Gamma-Laguerre model. The results clearly illustrate the dependence of the shapes of the density functions on the level of the sources degree of coherence and on environmental parameters. It is shown that the optimal source coherence level may be experimentally found to obtain the narrowest profile for the intensity PDF.

Original languageEnglish (US)
Pages (from-to)69-82
Number of pages14
JournalWaves in Random and Complex Media
Volume24
Issue number1
DOIs
StatePublished - Jan 2 2014

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probability density functions
Probability density function
Light sources
atmospheres
Laser beams
Statistics
statistics
laser beams
Scintillation
distribution moments
Photodetectors
Distribution functions
Data acquisition
light modulators
scintillation
data acquisition
photometers
proximity
acquisition
receivers

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Engineering(all)

Cite this

The dependence of the intensity PDF of a random beam propagating in the maritime atmosphere on source coherence. / Avramov-Zamurovic, S.; Nelson, C.; Malek-Madani, R.; Korotkova, Olga.

In: Waves in Random and Complex Media, Vol. 24, No. 1, 02.01.2014, p. 69-82.

Research output: Contribution to journalArticle

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