Laser guiding in hollow optical fibers: atom fluxes and viscous heating force

Summary form only given. We present a theoretical model aimed at interpreting our experiments on optical guiding of neutral atoms through hollow-core fibers. We present calculations of the atomic flux of atoms guided through a fiber and investigate its dependence on the intensity of the laser light, detuning from the resonance and the fiber bend radius. For relatively short and/or large-diameter fibers the contribution of the nonconservative force is negligible and the experimental results are well described by the conservative contribution. In the opposite limit we find a clear signature of the viscous heating force manifested in the appearance of additional maxima in the dependence of the flux on the detuning and in the decrease of the flux with laser intensity.