Document Type

Conference Paper

Disciplines

Optics

Publication Details

Proceedings Volume 12574, Holography: Advances and Modern Trends VIII; 1257405 (2023)
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Holographic Optical Elements (HOEs) have the potential to enable more compact, versatile and lightweight optical designs, but many challenges remain. Volume HOE’s have the advantage of high diffraction efficiency but they present both chromatic selectivity and chromatic dispersion which impact on their use with wide spectrum light sources. Single-colour LED sources have a narrow spectrum that reduces these issues and this makes them better suited for use with volume HOEs. However, the LED source size must be taken into consideration for compact volume HOE-LED systems. To investigate the design limits for compact HOE-LED systems, a theoretical and experimental study was carried out on the effects of an extended source on the HOE output for different holographic lenses, with focal lengths from 2.5-10 cm. The lenses were recorded in Bayfol HX200 material and their diffraction efficiency was characterised across the lens aperture by measuring the Bragg angular selectivity curve at each location. Offset point sources were used to experimentally study the effects of a non-point source on the HOEs and the system was also modelled using Matlab and Zemax.

DOI

https://doi.org/10.1117/12.2665494

Funder

Science Foundation Ireland

Creative Commons License

Creative Commons Attribution-NonCommercial 4.0 International License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

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