Retrieving the OAM spectrum and the spatial distribution of the structured optical fields

Alessio D'Errico; Filippo Cardano

doi:10.1117/12.2508283

1 March 2019 Retrieving the OAM spectrum and the spatial distribution of the structured optical fields

Alessio D'Errico, Filippo Cardano

Proceedings Volume 10935, Complex Light and Optical Forces XIII; 109350J (2019) https://doi.org/10.1117/12.2508283
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Helical modes of light, that is those optical spatial modes carrying a definite amount of orbital angular momentum, are proving a crucial resource in modern photonics. In all applications that rely on these modes and on their combination, a fundamental role is played by the scheme that is used to characterise the complex structure of the light beam. Here we describe a technique that applies the concept of digital holography to the study of the orbital angular momentum content of structured light [1]. In particular, the interference pattern formed by the light beam under investigation and a reference field is analysed digitally, and the complete electric field is obtained. A decomposition in term of helical modes allows one to get the orbital angular momentum spectrum of the beam in a few steps, with the possibility of retrieving also the complex radial profile associated with each mode. Requiring a simple setup and a limited number of measurements, this technique could provide a convenient strategy for the characterisation of structured light beams.

Conference Presentation

Citation Download Citation

Alessio D'Errico and Filippo Cardano "Retrieving the OAM spectrum and the spatial distribution of the structured optical fields", Proc. SPIE 10935, Complex Light and Optical Forces XIII, 109350J (1 March 2019); https://doi.org/10.1117/12.2508283

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