TY - JOUR
T1 - The dependence of the intensity PDF of a random beam propagating in the maritime atmosphere on source coherence
AU - Avramov-Zamurovic, S.
AU - Nelson, C.
AU - Malek-Madani, R.
AU - Korotkova, O.
N1 - Funding Information:
O. Korotkova’s research is supported by US ONR (grant N0018913P1226) and US AFOSR (grant FA 955012-11-0449). Shawn Muder is acknowledged for technical support with instrumentation and data processing. Svetlana Avramov-Zamurovic, Reza Malek-Madani and Charles Nelson are sponsored by ONR (N001413 WX 20152).
PY - 2014/1/2
Y1 - 2014/1/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84894539654&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894539654&partnerID=8YFLogxK
U2 - 10.1080/17455030.2013.874055
DO - 10.1080/17455030.2013.874055
M3 - Article
AN - SCOPUS:84894539654
VL - 24
SP - 69
EP - 82
JO - Waves in Random and Complex Media
JF - Waves in Random and Complex Media
SN - 1745-5030
IS - 1
ER -