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Main Title: Influence of Pre-Exposure on the Material Response of Epoxy-Based Volume Holographic Recording Material
Author(s): Sabel-Grau, Tina
Type: Article
Abstract: The formation of volume holograms in photosensitive polymers is a complex process under the influence of many interacting factors: material composition and processing, exposure conditions, and pre-exposure affect the development and final characteristics of holographic gratings. In order to better understand the interplay of these influencing factors, the detailed investigations of holographic recording in a new organic material are performed and the results are presented here. The material response and performance of an epoxy-based free surface material designed for volume holography are investigated. For this purpose, time-resolved investigation of volume holographic grating growth is performed on the one hand. Spatially resolved analysis of volume holographic phase gratings by point-by-point scanning of the local material response to the Gaussian intensity distribution of the recording beams is carried out on the other hand. Thus, the influence of pre-exposure on the temporal grating formation, as well as on the final obtained refractive index contrast, was determined. The various effects observed can be explained by the consumption of photosensitive compounds and prior crosslinking in the course of pre-exposure. Rather unexpected effects are that, on the one hand, pre-exposed gratings emerge with ever more complete null diffraction at the transition point and, on the other hand, a stabilizing effect of some degree of pre-exposure on regions exposed with low intensity was identified.
Subject(s): photosensitive polymers
volume holographic gratings
diffractive optical elements
material response
holographic grating formation
refractive index contrast
Issue Date: 28-May-2022
Date Available: 15-Jun-2022
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Journal Title: Polymers
Publisher: MDPI
Volume: 14
Issue: 11
Article Number: 2193
Publisher DOI: 10.3390/polym14112193
EISSN: 2073-4360
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie » FG Nanostrukturierte Biomaterialien
Appears in Collections:Technische Universit├Ąt Berlin » Publications

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