چكيده به لاتين
The aim of this study was to compare the optical and physical effects of Nd YAG laser radiation in two modes of single-wavelength radiation (1064 nm) and dual-wavelength radiation with a Dual wavelength (532 + 1064 nm) on polyethylene terephthalate polymer. The determining parameters in this study, which distinguish it from similar studies, are the specific type of laser, its irradiation mechanisms, and the specific polymer of polyethylene Therefore, due to the precise comparison between the two types of radiation, we establish the same conditions in both experiments, to determine the difference between the radiation effects in the two cases under these same conditions. Since pure polyethylene terephthalate is a polymer with low light absorption and is classified as a thermoplastic polymer in the classification of polymers, it is mainly used as a transparent material in conversion processes, especially in laser processes. On the other hand, the modification of the surfaces of different materials by their laser radiation can be optimized by methods, so that by choosing the appropriate material and the most optimal type of radiation, high-quality welds, desired microstructures and desirable mechanical effects can be achieved. . In the present study, which was performed in a laboratory method, the morphological aspects, the quality of the cavities created in depth and the chemical changes caused by the connection of the first harmonic and the combined harmonic (first and second) of Nd YAG laser with polyethylene terephthalate while increasing the repetition rate and number Laser pulses were tested and recorded and the results were analyzed by electron microscopy as well as FTIR and UV-VIS spectroscopy. Laboratory observations confirmed the differences in the radiation effects of the laser, including greater energy binding, smoother cavities, higher aspect ratios, and less heat-affected zone in the Dual wavelength radiation than in the single-wavelength. Also, the results of spectroscopy showed that in both experiments, there is no chemical bond formation or destruction in the irradiated samples and only the concentration of some bonds changes and the rate of change in the intensity of concentrations in Dual wavelength radiation is more than the single-wavelength.
