The effect of Raman spontaneous scattering Factor (Ksp
) on characteristics of passive Q- switching and Raman pulses of (Nd:YVO4, Cr+4:YAG and BaWO4) system has been simulated. A software computer program based in this study to solve the rate equations model using Runge- kutta - Fehalberg numerical method. The study shows that the increase in the value of Ksp
leads to an increase photons density, energy, and, the power of passive Q-switching and Raman pulses. While small effect on pulses duration. The final value of the population inversion decreases with the increase of Ksp
.
Analytical and numerical analysis of electromagnetic wave propagation in cylindrical waveguides filled with isotropic metamaterial is presented. Emphasis is given to the characteristics of power flux in the waveguide. In the structure of the waveguide, The characteristics equation for the modes in this waveguide is obtained. The behavior of the dispersion curves and the energy flux are examined theoretically. The negative energy flux propagation through the cylindrical waveguide is confirmed.
The effect of saturable absorber material length on characteristics of passive Qswitching and Stokes pulses has been simulated. A software computer program has been based for solving a rate equations model numerically by Rung-Kutta-Fehalberg method. (Nd:GdVO 4), (Cr +4 :YAG), and Ba(NO 3) 2 are used as a active medium, saturable absorber material, and Raman medium respectively. The study shows that an decrease in pulse duration for both pulses (passive Q-switching and Stocks) with saturable absorber material length increases. While the energy and the power are increase with saturable absorber material length increases.
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