Conference Paper

 
a)
b) 
Fig.1 (a) Illustration view of experimental setup diode pumped Nd:YAG laser (model 
PL2231-50); (b) the optical microscopy and SEM images of initial aluminum surface  
According to images of optical microscope, the surface of the aluminum is homogenous. As 
can be seen from this image on the surface of the aluminum presents surface inclusions 
formed as a result of the heating and cooling process. Besides, there are longitudinal micro 
strips (before mechanical polishing) of rolled metallic foil of various lengths were observed in 
aluminum Fig. 1 (b) due to the rotation, elongation and pressure of the rolling shafts.
According to the image of SEM and optical microscope, surface of the treated sample 
contains section with uniform distributed micro holes as array template. 
With increased image resolution of single hole, edge inhomogeneities in the form of round 
bulges are observed. The round shape bulges which is located by the edges of the holes have 
diameter up to 50 μm, the holes diameter ~20 μm (see fig. 

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Техник ва технологик фанлар со
ҳ
аларининг инновацион масалалари. ТДТУ ТФ 2020 
183 
2 (b). The XRD characteristics of samples were measured using powder diffractometer 
PANalytical Empyrean diffractometer (CuKα-radiation) from 5-90
0
2θ, an acceleration 
voltage of 45 kV and an electron generating current of 40 mA and shown in figure 3. 
According to XRD pattern the structure revealing metallic aluminum. The basic peaks before 
laser irradiation present in Fig 3. The experimental results demonstrate that high quality 
pattern surface can be obtained by tuning the picosecond laser irradiation and beam scanning 
speed, which provides insights for micro drilling. On the metallic surface, partial absorption 
of radiation occurs, as a result of which the metal heats up under the influence of pulsed laser 
radiation of a fixed range. The superior capabilities of picosecond lasers are associated not 
only with the short pulse duration but also with the repetition rates range in several MHz; the 
higher repetition rate divides the total pulsing energy into a large number of short pulses 
resulting in the induction of sufficient influence in order to generate the melting regime of 
metal surface.