Multiple scattering of light by resonant vapor is characterized by Lévy-type superdiffusion with a single-step size distribution $p\left(x\right)\propto 1/x^{1+\alpha }$. We investigate Lévy flight of light in a hot rubidium vapor collisional-broadened by 50 torr of He gas. The frequent collisions produce Lorentzian absorptive and emissive profiles with $\alpha <1$ and a corresponding divergent mean step size. We extract the Lévy parameter $\alpha \approx 0.5$ in a multiple-scattering regime from radial profile of the transmission and from violation of the Ohm's law. The measured radial transmission profile and the total diffusive transmission curves are well reproduced by numerical simulations for Lorentzian line shapes.

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• Diffusion
• Levy flights
• Light propagation, transmission & absorption
• Random walks