Abstract
Ultraintense optical vortices carrying orbital angular momentum have attracted much attention in strong-field laser physics due to their spiral phase and hollow intensity. This Letter introduces a fully continuous spiral phase plate (FC-SPP) that enables the generation of an ultraintense Laguerre–Gaussian beam. An optimization design method based on the spatial filter technique and chirp-z transform is proposed to match the polishing processing and the tightly focusing performance. To enable its use in high-power laser systems, a large-aperture (200 × 200 mm2) FC-SPP has been fabricated on a fused silica substrate through magnetorheological finishing without the use of mask techniques. The far-field phase pattern and intensity distribution based on vector diffraction calculation were compared with those of ideal spiral phase plate and fabricated FC-SPP, which confirmed the high quality of the output vortex beams and their feasibility for producing high-intensity vortices.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Jingtao Xin, Kunjian Dai, Lei Zhong, Quanxin Na, and Chunqing Gao
Opt. Lett. 39(7) 1984-1987 (2014)
Yonghao Liang, Enliang Wang, Hailiang Li, and Changqing Xie
Opt. Lett. 44(4) 935-938 (2019)
Andrew Longman, Carlos Salgado, Ghassan Zeraouli, Jon I. Apiñaniz, Jose Antonio Pérez-Hernández, M. Khairy Eltahlawy, Luca Volpe, and Robert Fedosejevs
Opt. Lett. 45(8) 2187-2190 (2020)