By using a bulk GaAs as an output coupler as well as a saturable absorber, with changing of concentration of defects
inside the laser cavity, Q-switching of flash-lamp pumped Nd:YAG laser has been studied. It is shown that the
mechanism of formation of the laser pulses, in a wide range of duration which were reported in a lot of previous papers
is caused by the intracavity changes of the defect concentration in a GaAs.
KEYWORDS: Solar energy, Chemical elements, Solar radiation, Solar concentrators, Nd:YAG lasers, Absorption, Laser development, Laser applications, Neodymium, High power lasers
For effective conversion of the energy of the concentrated solar flux of 1 MW Big Solar Furnace of the Scientific and
Production Association "Physics-Sun" (Tashkent) with focal spot size of about 40 cm into the coherent laser radiation,
the several designs of the multi-element secondary concentrators for various active mediums with different thermal and
optical characteristics were considered. For calculations of parameters of secondary concentrators the Ray tracing and
Monte-Carlo methods were used and the numerical experiments were performed.
The new method for determination of the filament onset distance of a high-power ultra short laser pulses in turbulent
atmosphere is discussed. The results in a good agreement with outcomes of the slowly varying amplitude method.
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