Rotation of two-petal laser beams in the near field of a spiral microaxicon

Authors

S. S. Stafeev, Samara National Research University and RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, Russia
Liam O'Faolain, Cappa Centre, Cork Institute of Technology, Cork, IrelandFollow
M. V. Kotlyar, Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Samara, Russia

Document Type

Article

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Disciplines

Atomic, Molecular and Optical Physics | Computer Engineering | Electromagnetics and Photonics | Optics | Physical Sciences and Mathematics

Publication Details

Computer Optics

Abstract

Using a spiral microaxicon with the topological charge 2 and NA = 0.6 operating at a 532-nm wavelength and fabricated by electron-beam lithography, we experimentally demonstrate the rotation of a two-petal laser beam in the near field (several micrometers away from the axicon surface). The estimated rotation rate is 55 °/mm and linearly dependent on the on-axis distance, with the theoretical rotation rate being 53 °/mm. The experimentally measured rotation rate is found to be linear and coincident with the simulation results only on the on-axis segment from 1.5 to 3 mm. The experimentally measured rotation rate is 66 °/mm on the initial on-axis segment from 0 to 1.5 mm and 34 °/mm on the final segment of the beam path from 3 to 4.5 mm. The experimentally achieved rotation rate is higher than rotation rates of similar two-petal laser beams reported to date.

Recommended Citation

Stafeev SS, O'Faolain L, Kotlyar MV. Rotation of two-petal laser beams in the near field of a spiral microaxicon. Computer Optics 2018; 42 (3): 385-391