Investigations of Intensity Correlations of Scattered Light from Laser-Cooled Atoms
For a polarized light wave from a chaotic sample g (2)(τ) = 1 + S|g (1)(τ)|2, where g (2)(τ) ≡ 〈I*(t)I(t + τ)〉/〈I(t)〉2 is the degree of second order coherence . S depends on the spatial coherence of the light-detection system, and is independent of τ. The degree of first-order coherence g (1)(τ) is simply the Fourier transform of the frequency spectrum I(ω). Thus g (2)(τ),the normalized intensity correlation function, gives spectral information about the light produced from the sample.
KeywordsSpatial Coherence Intensity Correlation Radiation Trapping Order Coherence Optical Molas