High power radiators of ultra-short electromagnetic quasi-unipolar pulses

Photoacoustic generation of focused quasi-unipolar pressure pulses.

The photoacoustic effect was employed to generate short-duration quasi-unipolar acoustic pressure pulses in both planar and spherically focused geometries. In the focal region, the temporal profile of a pressure pulse can be approximated by the first derivative of the temporal profile near the front transducer surface, with a time averaged value equal to zero. This approximation agreed with exp...

Deep Learning Reconstruction of Ultra-Short Pulses

Ultra-short laser pulses with femtosecond to attosecond pulse duration are the shortest systematic events humans can create. Characterization (amplitude and phase) of these pulses is a key ingredient in ultrafast science, e.g., exploring chemical reactions and electronic phase transitions. Here, we propose and demonstrate, numerically and experimentally, the first deep neural network technique ...

Formation of nanoparticles by short and ultra-short laser pulses

The main objective of this study is to explain the experimental observations. To simulate material ablation, plume formation and its evolution, we developed a combined molecular dynamics (MD) and direct simulation Monte Carlo (DSMC) computational study of laser ablation plume evolution. The first process of the material ablation is described by the MD method. The expansion of the ejected plume ...

Generation of Ultra-short Optical Pulses Using Nonlinear Dynamics

Non-linear pair production in scattering of photons on ultra-short laser pulses at high energy

Article history: Received 30 November 2009 Received in revised form 4 February 2010 Accepted 8 February 2010 Available online 11 February 2010 Editor: A. Ringwald