This paper presents the experimental results on preliminary study of the physical proprieties of the multimode optical fiber in radiation field delivered by electron linear accelerator of the National Research and Development Institute for Laser, Plasma and Radiation Physics (INFLPR). This study is based on the physical degradation effect of the optical fiber due to electron beam exposure measured through dependence of the exposure dose in electron beam and radiation induced attenuation. Optical fiber attenuations were measured before, during and after electron beam exposure. Results show a greater attenuation for multimode optical fiber of lower wavelength.
In the last decade we have applied with consistent results the integral transform technique in solving the classical heat
equation for determining the thermal fields in laser-solid interaction. In the present paper we apply for the first time this
powerful mathematical instrument for laser-transparent liquids interaction in order to find the thermal field of this
In this paper, some devices were reviewed to be used in quantum communications. We presented a low density of
Quantum Dots, which could be used to get single quantum dot as light emitting source for generating single photons. An
analytical model to study the thermal behavior of a solid media in interaction with one, two or three laser beams was
developed using the classical heat equation. Integrated optic micro-ring resonators and its simulated result also are
presented. Development of active micro-ring in silicon is at an early stage, where both vertical and horizontal techniques
are feasible. With the epitaxy growth techniques, a possibility for achieving controllable QD density, size and good
uniformity are proposed. A low density of QDs in range of 10<sup>8</sup> cm<sup>-2</sup> has demonstrated through successive adjustment of
the growth parameters. Details among the devices are presented and discussed.
A new theoretical model of an undulator for free electron lasers is presented. The current undulator structure is a series of hypocicloidal wires. The magnetic field components for each wire present a 120 degree symmetry (for a model with 3 branches). This new treatment of the problem could be extended to the nonlinear dynamical analysis of the electrons in the studied structure.
The reciprocity theorem is referred to the equivalence of the obtained relations for the Smith-Purcell radiation, in both cases when the electron beam is propagating forward and backward with respect to the metal grating, respectively. The results of the radiation factor for the Smith-Purcell radiation in the ((theta) , (phi) ) direction generated by relativistic electron beams with energy up to 100 MeV and rectangular perfectly conducting gratings are presented. The results obtained prove the equivalence of the Smith-Purcell radiation field in both cases of propagation for the electron beam.
This paper presents the efficiency of Smith-Purcell radiation generation for lamellar and triangular metal gratings (MG) in H-polarization. The efficiency was calculated by the modal expansion method for lamellar MG and the improved point matching method for triangular MG, respectively. Most important MG parameters involved in the calculation were: the space period, the total number of grooves, the profile and the shape of the groove, and the geometry of the reflecting surface. Calculations were performed for relativistic electron beams with energies in 1-50 MeV domains. The emission angle of coherent SP radiation depending on MG and REB parameters is also presented.