Position control of parallel nondifracting beams with individual axial profiles

As the technology industry develops, increasingly heavier microprocessing tasks emerge, requiring smaller dimensions, higher precision or more complex shapes, so the laser becomes an important player in this market. Since Gaussian beam is not ideal for microprocessing applications of transparent materials due to diffraction, an increasing number of applications for laser beams with a focal line, also known as nondiffracting Bessel-Gaussian beams, can be easily noticed in the literature. Due to their elongated profile they can be perceived as "optical needles" being one of the most prominent family members of nondiffracting beams. Unfortunately, the transverse profile of Bessel beams is symmetric and their axial intensity distribution is uncontrollable. However, there is a need within the laser industry both to change the transverse profile of an optical needle and to control (engineer) its axial distribution. Using the superposition of the nondiffracting beams on the axis, we can partially control the axial intensity of the linear focus, which we describe by a desired function, and use the translation theorem for nondiffracting beams to create spatial structures of such parallel beams. The main tasks of this work are by using a spatial light modulator to experimentally realize various beams of many parallel nondiffracting beams with controlled positioning and selected axial intensity distribution. Also to investigate their position and form control capabilities and the resulting side effects of such superpositions