Laguerre-Gaussian mode sorters of high spatial mode count

Nicolas K. Fontaine; Roland Ryf; Haoshuo Chen; David T. Neilson; Kwangwoong Kim; Joel Carpenter

doi:10.1117/12.2560595

3 January 2020 Laguerre-Gaussian mode sorters of high spatial mode count

Nicolas K. Fontaine, Roland Ryf, Haoshuo Chen, David T. Neilson, Kwangwoong Kim, Joel Carpenter

Proceedings Volume 11203, Advances in Optical Astronomical Instrumentation 2019; 1120319 (2020) https://doi.org/10.1117/12.2560595
Event: ANZCOP, 2019, Melbourne, Australia

Abstract

We discuss the extension of Laguerre-Gaussian (LG) mode sorters to higher spatial mode counts. LG mode sorters based on multi-plane light conversion were recently demonstrated. The device consist of a cascade of phase planes separated by free-space propagation which performs a spatial decomposition in the Laguerre-Gaussian basis. Whereby an incoming beam, described by a basis of N LG modes is mapped onto a Cartesian array of N Gaussian spots in the output plane. Each spot in the array contains a particular LG spatial component of the original beam. Previously, LG mode sorters have been demonstrated supporting as many as 325 modes using 7 planes. In this paper we present a design for a device that supports 1035 modes corresponding with the first 45 degenerate mode groups using 14 planes. At the centre wavelength, the device has a theoretical insertion loss of 2.10dB. The lowest loss LG mode is -1.65dB and the highest loss LG mode is -3.22dB. The average crosstalk over all modes is 12.75dB. The worst-case mode has a crosstalk of 9.20dB.

Citation Download Citation

Nicolas K. Fontaine, Roland Ryf, Haoshuo Chen, David T. Neilson, Kwangwoong Kim, and Joel Carpenter "Laguerre-Gaussian mode sorters of high spatial mode count", Proc. SPIE 11203, Advances in Optical Astronomical Instrumentation 2019, 1120319 (3 January 2020); https://doi.org/10.1117/12.2560595

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