Education of the republic of uzbekistan tashkent state technical university named after islam karimov

Figure 2. Results for the 50 fs case. The presentation of the results obtained corresponds 
to part (a) of the Figure 1. 

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Electrical and Computer Engineering
179 
In turn, condition (II) (i.e., specified by the solid line) in this case is the input of the 
third-order medium (
 
3
0


) are not taken into account, only calculations of the state are 
given taking into account the dispersion of the medium (
 
0
D


). Finally, in case (III) (point 
to point), the dispersion of the medium (
 
0
D


) and third-order inputs (
 
3
0


) are the 
results obtained for unaccounted-for cases. Finally, when we ran our calculations at 20 fs, we 
noticed that the situation was radically different from the one described above. The results are 
shown in the third figure.
Figure 3. Results for the 20 fs case. The presentation of the results obtained corresponds 
to Figure 2. 
As can be seen from the figure, the dispersion of the medium (
 
0
D


) A sharply 
reduced efficiency of the OPU (in this case (II) solid lines no more than 10%). In turn, the 
dispersion of the medium (
 
0
D


) also take into account the third-order input (
 
3
0


) 
Further decrease in the efficiency of the OPU. This corresponds to condition (I) (indicated by 
dotted lines). Here, the efficiency of the OPA did not exceed 3%. In conclusion, it should be 
noted that in the OPA process when using high-intensity short-pulse lasers, the average 
dispersion (
 
0
D


) is also the third-order medium permeability (
 
3
0


) should be 
considered.