3. Wochenbericht ANT-XXIII/10

Polarstern XXIII/10 Am 12. April 2007 hatte das Forschungschiff Polarstern unter der Fahrtleitung von Prof. Dr. Andreas Macke den Atlantiktransfer von Kapstadt nach Bremerhaven angetreten

Comment on ''Inverse Doppler shift and control field as coherence generators for the stability in superluminal light''

In their study of inverse Doppler shift and superluminal light [Phys. Rev. A 91, 053807 (2015)], Ghafoor et al. consider a three-level atomic arrangement with transitions in the optical domain. In fact, the values they give to the parameters lead to a probe wavelength lying in the decimeter band. We point out that the Doppler shifts are then negligible and remark that the simulations performed by Ghafoor et al. do not evidence any superluminal effect

Comment on "Gain-assisted superluminal propagation and rotary drag of photon and surface polaritons"

In their study of superluminal propagation, rotary drag and surface polaritons [Phys. Rev. A 96, 013848 and 049906(E) (2017)], Khan et al. consider a four-level atomic arrangement with transitions in the optical domain. In fact, the values they give to the parameters lead to a probe wavelength lying in the decimeter band and we point out that, in such conditions, all their results are irrelevant

Monte Carlo Radiative Transfer Simulations on the Influence of Surface Waves on Underwater Light Fields

A Monte Carlo model has been developed for calculating the penetration of light into the ocean. For monochromatic light (490 nm) the spatial exact allocation of the scattered parts of underwater light is described in terms of the variation of particle content and the angle of light incidence. Based on this model, it is possible to generate complex spatiotemporal fluctuating light fields according to every possible shape of the water surface. By means of single gravity waves the focusing effect and its importance of radiance supply for water depths up to 100 m is discussed