19 August 2008 Coherent area inside partially coherent laser beam through atmospheric and sea water turbulences
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Abstract
Degree of coherence of partially coherent beam is degraded when it propagates through atmospheric turbulence, remaining a very small coherent area inside the beam. Such small coherent area is not enough for the applications of laser communications and laser radar where a rather large coherent area is necessary for the optical imaging, especially for the heterodyne detection. In this paper, we start from cross-spectral density matrix of partially coherent beam on propagation through turbulence. Ratio of energy degradation is defined to represent the effect of residual coherent area inside the partially coherent laser beam. And we also give the evolvement of the residual coherent area inside partially coherent laser beam through channels involving atmospheric and sea water turbulences, respectively.
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Wei Lu, Wei Lu, Liren Liu, Liren Liu, De'an Liu, De'an Liu, Jianfeng Sun, Jianfeng Sun, Aimin Yan, Aimin Yan, } "Coherent area inside partially coherent laser beam through atmospheric and sea water turbulences", Proc. SPIE 7091, Free-Space Laser Communications VIII, 70910U (19 August 2008); doi: 10.1117/12.793977; https://doi.org/10.1117/12.793977
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