APPLIED LASER, Volume. 42, Issue 7, 147(2022)
Research on High Power RF-Excited Slab CO2Laser for Generation of A Donut Mode Beam
Donut mode with annular shaped light distribution has the ability to carry the orbital angular momentum corresponding to the optical axis, which has attracted wide attention in scientific research, laser processing and other fields. In this paper, a diffractive optical element and a spiral phase plate have been used respectively to convert the mode similar to fundamental Gaussian beam into the Donut mode beam, while the propagation characteristics, beam quality, and efficiency of beam shaping for the shaped beam are analyzed. The results show that near-field propagation characteristics of the shaped beam are unacceptable when use the diffractive optical element which similar to the ring-shaped concave mirror structure designed by the G-S algorithm. However, better near-field propagation characteristics of the Donut mode beam is finally obtained through the spiral phase plate, and the far-field characteristics of Donut mode beam are relatively ideal. The efficiency of beam shaping is 97.1%, and the beam quality M2 factor is 2.29.
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Wang Wei, Wan Wen, He Qiong, Yang Sheng, Li Yong, Shi Jinfa. Research on High Power RF-Excited Slab CO2Laser for Generation of A Donut Mode Beam[J]. APPLIED LASER, 2022, 42(7): 147
Received: Sep. 2, 2021
Accepted: --
Published Online: May. 23, 2024
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