Consider a quasi-monochromatic wave with a mean frequency <ω>. Show that the complex degree of coherence γ(1)(τ) can be written in the form γ(1)(τ)=|γ(1)(τ)| exp[j(<ω>τ-ψ(τ)], where |γ(1)(τ)| and ψ(τ) are slowly-varying functions of τ on a time scale 2/<ω>.
KeywordsGaussian Beam Speckle Pattern Spatial Coherence Beam Waist Coherence Time
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