The creation of ultraviolet optical vortex beams with the topological charge of vertical bar l vertical bar = 1 at the wavelength of 325 nm was demonstrated from a He-Cd metal vapor laser with a spot defect mirror. The measured M-2 factor was close to the theoretical value of two of the LG(01) Laguerre-Caussian mode. Some interference experiments showed that the obtained vortex beams were stable enough for practical applications such as holographic lithography. (C) 2020 Optical Society of America
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