Journal of the Optical Society of America · 1979 · 297 citations · 11 references
EngineeringWave OpticCoherent SourceBeam OpticOptical PropertiesComputational ElectromagneticsOptical CommunicationOptical SystemsFree-space Optical NetworkPhotonicsAtmospheric TurbulenceLaser Beam PropagationClassical OpticsBeam OpticsOptical Beam PropagationSource CoherenceGeometrical OpticTurbulent AtmosphereCoherent ProcessExtended Huygens-fresnel Principle
The authors employed the extended Huygens‑Fresnel principle to derive general expressions for the mutual intensity of a partially coherent finite source in weak turbulence, formulated for focused and collimated Gaussian beams, and defined a far‑field range criterion based on source aperture, wavelength, coherence, and turbulence length, while examining beam spread and lateral coherence across parameter variations. Their analysis demonstrates that beam spread and lateral coherence vary with source and turbulence parameters, and analytic plots illustrate the functional behavior of these physical quantities.
The extended Huygens-Fresnel principle is used to formulate general expressions of the mutual intensity function for a finite optical source with partial spatial coherence propagating in the weakly turbulent atmosphere. Formulations are developed for both the focused and collimated Gaussian beam. Generalized criterion for the effective far-field range is defined in terms of the source aperture, optical wave number, source coherence, and characteristic length associated with the atmospheric turbulence. Beam spread and lateral coherence length in the near and far field are investigated for a combination of parameter variations and the physical implications discussed. Finally, analytic results are calculated and plotted to illustrate the functional behavior of relevant physical parameters.
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