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Materials 2016, 9(3), 194; doi:10.3390/ma9030194

Influence of 4,4’-azobis (4-cyanopentanoic acid) in Transmission and Reflection Gratings Stored in a PVA/AA Photopolymer

Dep. Optica, Farmacología y Anatomía, Universidad de Alicante, Apartado de correos 99, Alicante E-03080, Spain
Dep. Física, Ingeniería de Sistemas y Tª de la Señal, Universidad de Alicante, Apartado de correos 99, Alicante E-03080, Spain
Author to whom correspondence should be addressed.
Academic Editor: Manuel Francisco Ortuño Sánchez
Received: 27 January 2016 / Revised: 1 March 2016 / Accepted: 4 March 2016 / Published: 15 March 2016
(This article belongs to the Special Issue Photopolymers for Holographic Applications)
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Holographic transmission gratings with a spatial frequency of 2658 lines/mm and reflection gratings with a spatial frequency of 4553 lines/mm were stored in a polyvinyl alcohol (PVA)/acrylamide (AA) based photopolymer. This material can reach diffraction efficiencies close to 100% for spatial frequencies about 1000 lines/mm. However, for higher spatial frequencies, the diffraction efficiency decreases considerably as the spatial frequency increases. To enhance the material response at high spatial frequencies, a chain transfer agent, the 4,4’-azobis (4-cyanopentanoic acid), ACPA, is added to the composition of the material. Different concentrations of ACPA are incorporated into the main composition of the photopolymer to find the concentration value that provides the highest diffraction efficiency. Moreover, the refractive index modulation and the optical thickness of the transmission and reflection gratings were obtained, evaluated and compared to procure more information about the influence of the ACPA on them. View Full-Text
Keywords: holography; photopolymers; holographic recording materials holography; photopolymers; holographic recording materials

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fernandez, E.; Fuentes, R.; Belendez, A.; Pascual, I. Influence of 4,4’-azobis (4-cyanopentanoic acid) in Transmission and Reflection Gratings Stored in a PVA/AA Photopolymer. Materials 2016, 9, 194.

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