Multiplexing of Gaussian beam by multisector binary phase plate into scalar vortex beams for laser processing

Shkuratova V.A., Kostyuk, G.K., Petrov, A.A., Stepanyuk D.S., Nesterov N.A., Sennov A.A.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Шкуратова В.А., Костюк Г.К., Петров А.А., Степанюк Д.С., Нестров Н.А., Сеннов А.А. Мультиплицирование гауссова пучка многосекторной бинарной фазовой пластиной в скалярные вихревые пучки для лазерной микрообработки // Оптический журнал. 2023. Т. 90. № 5. С. 93–103. http:doi.org/10.17586/1023-5086-2023-90-05-93-103

Shkuratova V.A., Kostyuk G.K., Petrov A.A., Stepanyuk D.S., Nesterov N.A., Sennov A.A. Multiplexing of Gaussian beam by multisector binary phase plate into scalar vortex beams for laser processing [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 5. P. 93–103. http:doi.org/10.17586/1023-5086-2023-90-05-93-103

For citation (Journal of Optical Technology):

V. A. Shkuratova, G. K. Kostyuk, A. A. Petrov, D. S. Stepanyuk, N. A. Nesterov, and A. A. Sennov, "Multiplication of a Gaussian beam by a multisector binary phase plate into scalar vortex beams for laser microprocessing," Journal of Optical Technology. 90(5), 282-288 (2023)

Abstract:

Subject of study. A method of multiplexing of Gaussian laser beams into scalar vortex beams using multisector binary phase plates for increasing of the speed and productivity of laser microprocessing. The purpose of the work is to apply the technology of structuring transparent dielectrics by laser-induced microplasma for fabrication of multisector binary phase plates on fused silica. Methodology of the work. Multisector binary phase plates on fused silica with 4, 6, and 10 sectors with phase levels of 0 and p for operation at the wavelength of 1.06 µm were fabricated using an experimental setup for realization of laser-induced microplasma technology. We also applied additional annealing in a furnace to clean the surface and reduce the roughness of multisector binary phase plates in the area of laser-induced microplasma action. The fabricated multisector binary phase plates were tested by registration of generated intensity distributions in the plane of increased contrast using photosensitive camera and by ablation of steel samples. To evaluate an energy conversion efficiency, we measured the initial laser beam energy and the multisector binary phase plate output energy. Main results. The obtained results indicate that the fabricated multisector binary phase plates carry out multiplexing of Gaussian beam into a series of diffraction-limited spots surrounding the region with zero intensity and having the same intensity (standard deviation no more than 1%), the same spot diameters (standard deviation no more than 5%) and high energy conversion efficiency (around 92%). Practical significance. Such multisector binary phase plates fabricated by laser-induced microplasma have a real prospect for use in the field of laser microprocessing of materials.

Keywords:

multisector binary phase plate, multiplexing of Gaussian beam, scalar vortex beams, laser processing, laser-induced microplasma

OCIS codes: 220.4610, 230.4000, 050.4865, 050.5080

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