M2-factor of coherent and partially coherent dark hollow beams propagating in turbulent atmosphere.
Analytical formula is derived for the M(2)-factor of coherent and partially coherent dark hollow beams (DHB) in turbulent atmosphere based on the extended Huygens-Fresnel integral and the second-order moments of the Wigner distribution function. Our numerical results show that the M(2)- factor of a DHB in turbulent atmosphere increases on propagation, which is much different from its invariant properties in free-space, and is mainly determined by the parameters of the beam and the atmosphere. The relative M(2)-factor of a DHB increases slower than that of Gaussian and flat-topped beams on propagation, which means a DHB is less affected by the atmospheric turbulence than Gaussian and flat-topped beams. Furthermore, the relative M(2)-factor of a DHB with lower coherence, longer wavelength and larger dark size is less affected by the atmospheric turbulence. Our results will be useful in long-distance free-space optical communications.
Yuan
Yangsheng
Y
School of Physical Science and Technology, Soochow University, Suzhou 215006, China.
Cai
Yangjian
Y
Qu
Jun
J
Eyyuboğlu
Halil T
HT
Baykal
Yahya
Y
Korotkova
Olga
O
D001272:Atmosphere / Q000737:chemistry*; D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation