Abstract

We present an experimental demonstration of a Laguerre–Gauss (LG) spectrum measurement technique using variable focus lenses that is able to measure the strengths of the constituent modes in an unknown incoming light beam with the highest possible efficiency. The experiment modifies the classical projective, phase flattening technique by including a variable-sized pinhole and a two-electronic-lens variable imaging system that is tuned for each mode to give the highest possible detection efficiency irrespective of the beam waist of the LG mode chosen for the projection/decomposition. The modified experiment preserves the orthogonality between the modes with only a 4% cross talk so that superposition states may also be detected efficiently. Our experiment results show efficient detection of orbital angular momentum vortex beams with topological charge l values ranging from 0 to 4, with various beam waists chosen for the decomposition.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
High-efficiency phase flattening based Laguerre–Gauss spectrometer using variable focus lenses

Mumtaz Sheikh, Haad Yaqub Rathore, and Sohaib Abdul Rehman
J. Opt. Soc. Am. B 34(1) 76-81 (2017)

Instability of higher-order optical vortices analyzed with a multi-pinhole interferometer

F. Ricci, W. Löffler, and M.P. van Exter
Opt. Express 20(20) 22961-22975 (2012)

Study of the birth of a vortex at Fraunhofer zone

Alcenisio J. Jesus-Silva, Eduardo J. S. Fonseca, and Jandir M. Hickmann
Opt. Lett. 37(21) 4552-4554 (2012)

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 (10)

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

Tables (1)

You do not have subscription access to this journal. Article tables 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 (1)

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

Metrics

You do not have subscription access to this journal. Article level metrics 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