Abstract

We present a dynamic interferometry to measure the orbital angular momentum (OAM) of beams. An opaque screen with two nonparallel air slits is employed that can be regarded as the Young’s double-pinhole interference. When the OAM beams with an annular intensity distribution vertically incident, the far-field interference patterns depend on the phase difference of the light in the two pinholes. We scan the angle between the two slits, and the output intensity at center changes alternatively between darkness and brightness. Utilizing this characteristic, we can measure the OAM of light. This scheme is very simple and low-cost. In addition, it can measure very large topological charge of OAM beams due to continuous scanning.

© 2014 Optical Society of America

Double metal subwavelength slit arrays interference to measure the orbital angular momentum and the polarization of light

Hailong Zhou, Siqi Yan, Jianji Dong, and Xinliang Zhang
Opt. Lett. 39(11) 3173-3176 (2014)

Fraunhofer diffraction of light with orbital angular momentum by a slit

Queila S. Ferreira, Alcenísio J. Jesus-Silva, Eduardo J. S. Fonseca, and Jandir M. Hickmann
Opt. Lett. 36(16) 3106-3108 (2011)

Measuring orbital angular momentum superpositions of light by mode transformation

Gregorius C. G. Berkhout, Martin P. J. Lavery, Miles J. Padgett, and Marco W. Beijersbergen
Opt. Lett. 36(10) 1863-1865 (2011)

Quantitative measurement of the orbital angular momentum density of light

Angela Dudley, Igor A. Litvin, and Andrew Forbes
Appl. Opt. 51(7) 823-833 (2012)

Measuring orbital angular momentums of light based on petal interference patterns

Shengzhe Pan, Chunying Pei, Shuang Liu, Jin Wei, Di Wu, Zhanou Liu, Yaling Yin, Yong Xia, and Jianping Yin
OSA Continuum 1(2) 451-461 (2018)