Mohamed Ezzat

In this study, the impacts of laser irradiation on the surface morphology and hardness of copper (Cu) are investigated under various environments, including air, vacuum, and high-pressure gas flow through a supersonic nozzle. After irradiating Cu targets with laser pulses with energy of 30, 60, and 90 mJ/pulse, the surface structures of the targets...

Surface modification of materials (Al and Ag) was studied after nanosecond green laser irradiation in air, vacuum, and under different backing gas pressures (0.5, 1, and 1.5 bar) applied through a supersonic nozzle. Scanning electron microscopy and X-ray diffraction were used to observe the effect of the laser on the samples in different environmen...

This study investigates the surface modification of a material irradiated by a nanosecond Nd:YAG green laser while exposed to a gas flow. Scanning electron microscopy images and X-ray diffraction profiles illustrate the effect of laser irradiation in different environments, especially under backing gas pressures of 0.5, 1, and 1.5 bar applied throu...

A localized nanoparticle insertion scheme is developed to decouple electron injection from laser evolution in laser wakefield acceleration. Here we report the experimental realization of a controllable electron injection by the nanoparticle insertion method into a plasma medium, where the injection position is localized within the short range of 10...

Study on the thermal effects in Tm:YLF laser crystals has been carried out through the calculations and numerical modeling simulation of temperature and stress distributions. The temperature and stress distributions in the Tm:YLF laser rods are calculated with finite element (FE) simulations for a rod with a length of 12mm and a diameter of 5 mm an...

Aluminum and its alloys are widely used in our daily life because of their desirable physical properties. Improving the quality of Al-alloys surface layers is required for industrial applications. Nd: YAG pulsed Nanosecond Laser was used in irradiating aluminum1100 alloy to study the surface morphology and hardness properties. Scanning Electron Mic...

Compound nucleus creation in Ultra Intense Laser UIL interaction with materials could be possible through Fusion-of the target nuclei with the accelerated charged ions in the laser field. The residual radioactive nuclei in the remaining target material could well be due to evaporation of protons, neutrons, deuterons etc. from the created compound n...

Quantum dot nano-crystalline silicon (Si-nc) colloidal solar cells are attracting the interest of researchers in view of improving its optoelectronic properties. We report the fabrication of Si-nc from two types of silicon p and pn-Si wafers. In this study the nano-crystallites were fabricated by Liquid Phase Pulsed Laser Ablation (LP-PLA) of silic...

One of the key component for a Laser Inertial Fusion Energy (LIFE) engine is the fusion chamber subsystem. There are different structure of chambers such as dry-wall, wetted-wall, thick-liquid wall, or solid/voids. The chamber contain material absorb the thermal fusion energy, produce fusion fuel to replace that burned in previous targets, and enab...

Quantum dot nano-crystalline silicon Si(nc) is recently attracting the interest of researchers to form colloidal solar cells. New structural forms are still needed to improve its optoelectronic properties. We report the fabrication of Si-nc from three types of silicon; p-type Si, n-type Si and p-n type Si wafers. In this study Si(nc) were fabricate...

Silicon is the most prevalent semiconductor used in microelectronics and photonics. However it still has some short comings as indirect band-gap material, poor light emitter, and low efficiency silicon solar cells. Research is still needed to find new forms of silicon with better properties. In this study we fabricated Si nanostructures applying Li...