期刊
OPTICS EXPRESS
卷 17, 期 20, 页码 17344-17356出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.017344
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资金
- National Excellent Doctoral Dissertation of PR China [200928]
- Natural Science of Jiangsu Province [BK2009114]
- AFOSR [FA 95500810102]
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. (C) 2009 Optical Society of America
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