Monte Carlo Simulation Of Femtosecond Laser Filaments In A Foggy Medium

Femtosecond filaments have for the last decade opened the route to fascinating physics due to their capability to convey high intensities over spectacular distance and due to the white light emitted by the filaments transforming infra red Lasers into white Lasers. However, there are a variety of deleterious features of the atmospheric channel that may lead to serious signal fading, most importantly of all absorption and scattering due to particulate matter in the atmosphere therefore the knowledge of femtosecond laser characteristics and its interaction with atmosphere is important as it opens the gate to new applications in remote sensing techniques and free space optical communication. In this paper the process leading to filamentation is briefly discussed while Monte Carlo technique is used to study the transmittance of a foggy medium with optical thicknesses 0.21, 2.1, 0.07 and 0.7 on the photons number. The results show that the foggy medium will act as an attenuator to the whole beam reaching the hypothesis that the number of filaments entering a medium is reduced with the same ratio a number of photons entering the same medium are reduced to.