Physics

  2010 MAR 23 - (VerticalNews.com) -- "We report on a detailed investigation of the coupling between a femtosecond-laser frequency comb and a cw diode laser interacting with an atomic medium of variable density," investigators in Recife, Brazil report.

  "The comb is printed on a Doppler-broadened atomic transition and the frequency-dependent transmission of the cw laser is monitored as it is scanned over the inhomogenously broadened absorption profile. The printing process and its probing are analysed, experimentally and theoretically, as a function of both laser intensities and the atomic density," wrote M. Polo and colleagues, Federal University ...read more

  2010 MAR 23 - (VerticalNews.com) -- According to recent research published in the Journal of Physics B - Atomic Molecular and Optical Physics, "The dependence of above threshold dissociation (ATD) dynamics of HD+ on the carrier-envelope phase (CEP) phi of the modulated laser pulse E(t) = E-0 sin(2 pi/T t - phi) sin(omega t) is studied theoretically by numerically solving the time-dependent Schrodinger equation including the molecular vibrational and rotational degrees of freedom. The energy-dependent spectra of dissociated fragments, resulting from the ATD, are calculated by using an asymptotic-flow expression in the momentum space. ...read more

  2010 MAR 23 - (VerticalNews.com) -- "Parametric interaction of a pair of cavity fields in a near-resonantly driven atomic system is described by a bilinear Hamiltonian that decouples from atomic flip operators and is proportional to the population difference between dressed states. For proper choice of parameters, the parametric interaction is enhanced by at least two orders compared to the dispersively dressed cases," scientists writing in the Journal of Physics B - Atomic Molecular and Optical Physics report ...read more