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We present an extensive Monte Carlo study on light transport in opticallythin slabs, addressing both axial and transverse propagation. We completelycharacterize the so-called ballistic-to-diffusive transition, notably in termsof the spatial variance of the transmitted/reflected profile. We test thevalidity of the prediction cast by diffusion theory, that the spatial varianceshould grow independently of absorption and, to a first approximation, of thesample thickness and refractive index contrast. Based on a large set ofsimulated data, we build a freely available look-up table routine allowingreliable and precise determination of the microscopic transport parametersstarting from robust observables which are independent of absolute intensitymeasurements. We also present the Monte Carlo software package that wasdeveloped for the purpose of this study.

Deducing effective light transport parameters in optically thin systems