A model of side pumping technique for a system of solar concentrators was performed for laser generation. Measurements for the total solar radiation in the hot desert area near Helwan which is south of Cairo by 30 km, of latitude 30°N and longitude 31°E were carried out. The instruments were installed on the rooftop of the National Research Institute of Astronomy and Geophysics (NRIAG). The measurements indicate that the annual average of the global solar radiation is 5·21 kWh/m2/day, direct solar radiation is 6·26 kWh/m2/day, diffuse solar radiation is 1·86 kWh/m2/day, the clearness index Kt is 0·61, and the diffuse fractionKD is 0·37. The performance of the laser rod and the performance of the system as a whole were tested. Finally, the measurements of solar radiation were applied to the model to obtain the behaviour of the laser output in different seasons, assuming that the concentrator system tracks the sun.
Volume 134, 2022
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