Basic diffraction phenomena in time domain

Basic diffraction phenomena in time domain.

Using a recently developed technique (SEA TADPOLE) for easily measuring the complete spatiotemporal electric field of light pulses with micrometer spatial and femtosecond temporal resolution, we directly demonstrate the formation of theo-called boundary diffraction wave and Arago's spot after an aperture, as well as the superluminal propagation of the spot. Our spatiotemporally resolved measure...

Diffraction of a Bose-Einstein Condensate in the Time Domain

Fast Time-Domain Edge-Diffraction Calculations for Interactive Acoustic Simulations

The inclusion of edge diffraction has long been recognized as an improvement to geometrical-acoustics (GA)modeling techniques, particularly for acoustic simulations of complex environments that are represented as collections of finite-sized planar surfaces. One particular benefit of combining edge diffraction with GA components is that the resulting total sound field is continuous when an acous...

Time-domain Fresnel-to-Fraunhofer diffraction with photon echoes.

A photon echo experiment in Tm(3+):YAG is reported that shows, for the first time to the authors' knowledge, the time-domain equivalent of the transition from near- to far-field diffraction, including Talbot self-imaging effects. The experiment demonstrates the huge dispersion capability of photon echoes and opens the way to further exploration of space-time duality.

The Laser Plasma: Basic Phenomena and Laws

High power lasers when focused onto matter lead to extremely rapid ionization by direct photoeffect or, depending on wavelength and material, by multiphoton processes. When a sufficient number of free electrons is created the formation of a dense, highly ionized plasma is more efficiently continued by electron–neutrals and electron–ion impact ionization. In view of many important applications t...