Acousto-Optical Tuneable Filter design for efficient diffraction of unpolarised light

Samuel Dupont*, Jean-Claude Kastelik, J. Vanhamel , Emmanuel Dekemper

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Diffraction of optical waves by an acoustic grating is a well-known phenomenon that enables the design of very versatile devices useful in photonic systems. For example, Acousto-Optic Tuneable Filters (AOTFs) can be dynamically tuned by radio-frequency signals. Among possible material choice, tellurium dioxide crystal is often used for practical applications due to its high efficiency. In such a birefringent material, the anisotropic configuration is often used. A feature of this configuration is the sensitivity to optical input polarisation: a selective coupling between polarized modes occurs. The incident must be polarised and
the diffracted mode polarisation is orthogonal to the incident one.
However, during the design process a very specific operation point can be found that ensures the simultaneous diffraction of both the ordinary and the extraordinary optical modes. In this presentation, we introduce the design of AOTF in birefringent crystals and present the main parameters that are subject to trade-off. Acousto-optic diffraction efficiency is sensitive to the so-called phase matching condition between optical wave and the ultrasonic
wave. The offset from synchronicity is considered introducing a phase mismatch parameter. Diffraction efficiency evolution with respect to Bragg condition offset are illustrated. A custom device is finally presented that ensures simultaneous diffraction of both polarisation modes and compared to experimental results.
Original languageEnglish
Title of host publicationProceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023
EditorsArianna Astolfi, Francesco Asdrudali, Louena Shtrepi
Pages4935-4938
DOIs
Publication statusPublished - 2024
EventForum Acusticum 2023: 10th Convention of the European Acoustics Association - Torino, Italy
Duration: 11 Sept 202315 Sept 2023

Publication series

NameProceedings of Forum Acusticum 2023
ISSN (Print)2221-3767

Conference

ConferenceForum Acusticum 2023: 10th Convention of the European Acoustics Association
Country/TerritoryItaly
CityTorino
Period11/09/2315/09/23

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • AOTF
  • anisotropic diffraction
  • unpolarised light

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