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Coherent backscattering of light from random media has been studied intensively because of its relation to weak localization of photons [1]. Constructive interference of waves following a certain path and its time-reversed path in the medium yields an enhancement in the backscat- tered intensity. When the term "constructive interference" is used for the explanation of the origin of this enhancement, we implicitly as- sume that the light is perfectly coherent. Most of the studies relating to the coherent backscat- tering have been done under this assumption. In this paper we present an analytical ex- pression for a shape of the backscattering cone formed under illumination of the light with ar- bitrary spatial coherence. In a formulation, the statistical properties of the illuminating light is given by the angular correlation func- tion [2], which characterizes the correlation between two components of the angular spec- trum [3] of a light field. This plane-wave de- composition of the field allows us to make use of the analytical expressions [4] developed pre- viously for the coherent backscattering of scalar waves.
Takashi Okamoto
"Enhanced backscattering of light by disordered media: effects of spatial coherence", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27785K (1 September 1996); https://doi.org/10.1117/12.2299083
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Takashi Okamoto, "Enhanced backscattering of light by disordered media: effects of spatial coherence," Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27785K (1 September 1996); https://doi.org/10.1117/12.2299083