Spectral changes of partially coherent flat topped beam in turbulent atmosphere

Spectral characteristics of partially coherent flat-topped (PCFT) beams propagated in a turbulent atmosphere are investigated and an analytical formula for the spectrum S(ω) is derived. It is shown that, if the scaling law is valid, the normalized spectrum S(ω) of PCFT beams propagating through turb...

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Bibliographic Details
Published in:Optics communications 2008-04, Vol.281 (8), p.2173-2178
Main Authors: Alavinejad, M., Ghafary, B., Razzaghi, D.
Format: Article
Language:English
Subjects:
Atmospheric turbulence
Beam characteristics: profile, intensity, and power
spatial pattern formation
Change spectrum
Convection, turbulence, diffusion. Boundary layer structure and dynamics
Earth, ocean, space
Exact sciences and technology
External geophysics
Fundamental areas of phenomenology (including applications)
Laser optical systems: design and operation
Meteorology
Optics
Partially coherent flat-topped beam
Physics
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Summary:Spectral characteristics of partially coherent flat-topped (PCFT) beams propagated in a turbulent atmosphere are investigated and an analytical formula for the spectrum S(ω) is derived. It is shown that, if the scaling law is valid, the normalized spectrum S(ω) of PCFT beams propagating through turbulent atmosphere is the same as the normalized source spectrum S(0)(ω), this similarity is valid for any arbitrary order of the circular flat-topped “N”. It is proved that if the scaling law is not valid, S(ω) of PCFT is different from S(0)(ω). Also spectral behavior of PCFT beams in free space and turbulence media is investigated in detail.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2007.11.078