Abstract

We proposed a method to measure orbital angular momentum (OAM) states by using a multi-zone pure phase grating with the phase-shift technique. In free-space optical communication systems, the topological charges (TCs) of concentric OAM beams are usually detected for decoding, since the diameter of the OAM beam relates to the transmission distance. Two typical concentric OAM beams, concentric Laguerre–Gaussian beams and perfect vortex beams, were generated as incident beams, and the diffraction patterns can be separated by implementing a pure phase grating in the Fourier plane of a 4f system. By counting the corresponding diffraction fringes, we can identify the TCs of the two OAM states. The simulation results show that the diffraction angles of the concentric OAM beams can be controlled and two concentric OAM states can be measured simultaneously.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
In situ measurement of the topological charge of a perfect vortex using the phase shift method

Haixiang Ma, Xinzhong Li, Yuping Tai, Hehe Li, Jingge Wang, Miaomiao Tang, Yishan Wang, Jie Tang, and Zhaogang Nie
Opt. Lett. 42(1) 135-138 (2017)

Detecting the topological charge of optical vortex beams using a sectorial screen

Ruishan Chen, Xiaoqiang Zhang, Yong Zhou, Hai Ming, Anting Wang, and Qiwen Zhan
Appl. Opt. 56(16) 4868-4872 (2017)

Characterization of topological charge and orbital angular momentum of shaped optical vortices

Anderson M. Amaral, Edilson L. Falcão-Filho, and Cid B. de Araújo
Opt. Express 22(24) 30315-30324 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription