The strongly scattering colored and luminescence media are interested as coating with specific color characteristics and as active media of random lasers. Multiple scattering significantly influences the optical properties of the media. This work is devoted to simulation of the process of light propagation through the scattering medium under singular and multiple scattering regimes. The scattering medium is simulated by Monte-Carlo method as randomly located spherical particles dipped into the homogeneous substance. The interaction between light and particles is assumed to accord to geometrical optics that is applicable when particle size is larger than light wavelength.
The beam attenuation coefficient k_Σ was calculated versus the scattering particle concentration C_p and absorption coefficient of the interparticle substance k_a. The attenuation coefficient k_Σ monotonically grows with the C_p increasing. But it is essentially that k_Σ undergoes sharp change at certain particle concentration range when the absorbing interparticle substance is used. The change is sharpening with k_a increasing and is absent in the case of the non-absorbing substance k_a=0.
The sudden change was shown to appear at the particle concentration of single-to- multiple scattering regime transition. Out of the transition region the k_Σ (C_p) is a stepless function. The sudden change of the k_Σ (C_p) dependence is explained with additional absorption. It appears due to light path lengthening under the multiple scattering regime. The calculated dependencies are in good correlation with experimental results.

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