Figure 4.

Calculated ratio of the backscattering coefficient over the scattering coefficient (µ_b,NA / µ_s, equations (9) and (10)) as a function of optical particle diameter (D.k0, k₀ = 2π /λ₀,vacuum) for increasing volume fractions (0.01, 0.1, 0.2 and 0.3) at three common OCT wavelengths and bandwidths: λ₀ = 850 (∆λ 65) nm, λ₀ = 1050 (∆λ 81) nm and λ₀ = 1300 (∆λ 100) nm (the curves of the different wavelengths overlap). The used refractive index of the medium and silica beads were 1.324 and 1.425 at 1300 nm respectively, the refractive indices were varied with wavelength and bandwidth for the calculations. The typical Mie oscillatory pattern in the backscatter coefficient is clearly present. The black circles indicate the experimental data points A-H and the corresponding error bars.