Optical Modulation of Electron Beams in Free Space

Diffraction-free pulsed optical beams via space-time correlations.

Diffraction places a fundamental limitation on the distance an optical beam propagates before its size increases and spatial details blur. We show here that imposing a judicious correlation between spatial and spectral degrees of freedom of a pulsed beam can render its transverse spatial profile independent of location along the propagation axis, thereby arresting the spread of the time-average...

Differential Multi-Pulse Position Modulation for Free Space Optical Communication

In order to improve the laser output power in free space optical communication, it is necessary to improve the power efficiency of laser modulation as much as possible, in the case of the limitation of the laser. In this paper, based on the theory of pulse position modulation (PPM), a differential multi-pulse position modulation(DMPPM) scheme was designed, by consulting the structure characteri...

Methods for conditioning electron beams in free-electron lasers.

Incremental adaptive networks implemented by free space optical (FSO) communication

The aim of this paper is to fully analyze the effects of free space optical (FSO) communication links on the estimation performance of the adaptive incremental networks. The FSO links in this paper are described with two turbulence models namely the Log-normal and Gamma-Gamma distributions. In order to investigate the impact of these models we produced the link coefficients using these distribu...

Modeling of RF Waves in Free Space Optical Communication System Under Gamma-Gamma Turbulent Channel Effect

In this paper, an enhancement design of communication system using optical radio frequency (RF) waves in free space optical communication (FSO) system is presented. To our knowledge, it is the first time that the effect of Gamma-Gamma turbulent channel model on the performance of the proposed system is analyzed and simulated. To obtain an optical communication system with good performance and h...