We report the first experimental observation of self-trapped Airy beams in a nonlinear medium. As opposed to screening or photovoltaic spatial solitons, this new class of self-localized beams owes its existence to carrier diffusion effects. The asymmetric action of two-wave mixing supports the asymmetric intensity profile of the Airy states, with a balance that is independent of the beam intens...

A method to design lasers that emit an arbitrary beam profile is studied. In these lasers, output-coupling is performed by a diffraction grating that imposes a phase and amplitude distribution onto the diffracted light. A solid-state laser emitting beams with a two-dimensional Airy intensity profile is demonstrated both theoretically and experimentally. In this case, the diffraction grating add...

Reflection and refraction of a finite-power Airy beam at the interface between two dielectric media are investigated analytically and numerically. The formulation takes into account the paraxial nature of the optical beams to derive convenient field evolution equations in coordinate frames moving along Snell's refraction and reflection axes. Through numerical simulations, the self-accelerating ...

1. SYNOPSIS OF HISTORY I HAVE been asked to speak to you this evening on the subject of B C G vaccination against tuberculosis. For the benefit of those of you who are not familiar with the story, I thought I would give a brief outline of the history of the development of the vaccine. 'T'he vaccine is named after Calmette and Gu-erin, the two pioneer workers in this field of medical research. I...

We present an exact α s calculation of the Wilson coefficients associated with the dipole moment operators. We also give an estimate of the branching ratio for b → sγ. We find that higher dimensional effects are under control within 9% for BR(b → sγ) = (4.3 ± 0.37) × 10 −4 .