This paper discusses how the power of the free electron laser (FEL) beam was increased without increasing the size of the laser device by using a new model with a different technique for the undulator; the purpose of this technique is to make full use of the undulator magnets in a three-row system instead of the two-magnet system. This technique reduces the size of the laser device by decreasing the undulator’s length and controlling the path of electrons within the rows of the undulator magnets. From the analysis of the obtained simulation results, it can be concluded that it is possible to make the FEL device with double the power output without increasing the size of the device; this will increase future applications of the FEL in the civil and military fields. KEYWORDS Laser, coherent photons, wavelength, output power, magnets, SASE
The major problem facing the development of civil and military laser applications lies in the attempts to obtain short pulses close to the length of the bond that connects the atoms of certain materials. In this paper, an executable program has been constructed to simulate and analyze the generation of ultra-short free electron laser pulses; it contains several parameters directing the creation of short pulses within a time duration of femtoseconds (fs). On analyzing the simulation results, it can be concluded that it is possible to generate ultra-short pulses with a duration of about 7.4 – 87.4 fs with the storage ring free-electron laser Fabry–Perot resonator with noticeably short wavelengths (11.4–190.2) for the output laser beam. KEYWORDS Homogenous broadening; SR-FEL; undulator; energy spread gain; Q- switching
The effect of the Pierce parameter on the performance of the free electron laser system was shown using MATLAB simulation. Pierce parameter values ranged between (0.01 -0.03) for the laser beam with long wavelengths. The Pierce parameter represents the ratio between the saturation power and electrons power.The free electron laser is considered one of these important and advanced inventions because it provides a laser beam within various wavelengths of the electromagnetic spectrum. In any laser system device, several parameters must be available on which the efficiency and performance of the laser system are dependent. The Pierce parameter is one of the important parameters in measuring the performance quality of the free electron laser. In this paper, the simulation results were obtained using the MATLAB program to show the important effect of the Pierce parameter on the performance of the free electron laser system. The simulation results showed that the values of the Pierce parameter ranged between (0.01 -0.03) for the laser beam with long wavelengths, while it ranged between (0.001-0.0001) for the short wavelengths. The results showed an increase in the efficiency values of the free electron laser system with increasing the values of the Pierce parameter, which represents the ratio between the saturation power and the power of the electron; therefore, it can be used as a specific threshold to measure the efficiency of the laser system. Additionally, the simulation of the Pierce parameter has a direct relation to the small signal gain per unit length.
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