Tunable orbital angular momentum mode filter based on optical geometric transformation

Huang, H. et al. (2014) Tunable orbital angular momentum mode filter based on optical geometric transformation. Optics Letters, 39(6), pp. 1689-1692. (doi: 10.1364/OL.39.001689) (PMID:24690870)

Abstract

We present a tunable mode filter for spatially multiplexed laser beams carrying orbital angular momentum (OAM). The filter comprises an optical geometric transformation-based OAM mode sorter and a spatial light modulator (SLM). The programmable SLM can selectively control the passing/blocking of each input OAM beam. We experimentally demonstrate tunable filtering of one or multiple OAM modes from four multiplexed input OAM modes with vortex charge of ℓ=−9, −4, +4, and +9. The measured output power suppression ratio of the propagated modes to the blocked modes exceeds 14.5 dB.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lavery, Professor Martin and Padgett, Professor Miles
• Authors: Huang, H., Ren, Y., Xie, G., Yan, Y., Yue, Y., Ahmed, N., Lavery, M. P.J., Padgett, M. J., Dolinar, S., Tur, M., and Willner, A. E.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Optics Letters
• Publisher: Optical Society of America
• ISSN: 0146-9592
• ISSN (Online): 1539-4794