Ms. Christelle Delaite Profile

Christelle Delaite

at Univ de Haute Alsace

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Publications (2)

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Proceedings Article | 18 June 2024 Presentation + Paper

Development of polymer-dye hybrids for the optical limitation: photopolymerization versus thermal polymerization

Jade Caillieaudeaux, Morgane Guerchoux, Olivier Muller, Célia Bruder, Lionel Merlat, Anne-Sophie Schuller, Christelle Delaite

Proceedings Volume 12995, 1299504 (2024) https://doi.org/10.1117/12.3017430

KEYWORDS: Optical filters, Optical limiting, 3D printing, Matrices, Printing, Polymers, Photopolymerization

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High-intensity and low-divergence laser beams can cause damage to the human eye, sensors, and photoreceptors. In harsh environments, optical sensors can be damaged by pulsed laser radiation if exposed beyond their capacity. To protect against such threats, passive optical limiting devices are used. These devices are self-activated systems with a low activation threshold, neutral color, and low response time. Methacrylate-based thermosets were synthesized via radical polymerization using a reactive oligomer and a monomer. Two processes were investigated in this study: thermal polymerization, which is solvent-free, allows to collect directly the sample and can take several hours, and 3D printing, which uses photopolymerization to produce samples. This is an innovative method that allows for the production of multiple samples in under 10 minutes. Furthermore, a non-linear dye has been incorporated into the methacrylate matrix. In this study, optical filters with a methacrylate matrix and a 0.01 wt% loading dye are prepared by bulk polymerization and photopolymerization processes. The samples are then characterized to demonstrate the same chemical composition and thermal behavior. Finally, the optical limiting properties of the thermoset polymers at a wavelength of 1064 nm are investigated. The two processes are compared to determine their relevance.

Proceedings Article | 26 May 2022 Poster + Paper

Nonlinear optical methacrylate-based filters for optical limiting

Jade Caillieaudeaux, Olivier Muller, Morgane Guerchoux, Manon Dandois, Lionel Merlat, Anne-Sophie Schuller, Christelle Delaite

Proceedings Volume 12143, 121430J (2022) https://doi.org/10.1117/12.2621502

KEYWORDS: Optical filters, Optical limiting, Polymerization, Transmittance, Nonlinear filtering, Polymethylmethacrylate, Polymers, Nonlinear optics, Matrices

Read Abstract +

The human eye, sensors and photoreceptors can be damaged if they are submitted to laser beams with high intensities and low divergence. In the military field, an optical sensor can be exposed beyond its capacities and be damaged by pulsed laser radiations. In order to have a protection against such threats, passive optical limiting is used1. It is based on nonlinear effects which allow to reduce the intensity of aggressive laser radiations. Nowadays, the development of nonlinear filters for optical limiting is a challenge in order to have protection against threats caused by a pulsed laser beam. As a matter of fact, tactical lasers are a threat toward sensing devices between hundreds of meters and some kilometers.^2,3

This work has for purpose the synthesis of methacrylate-based hybrid polymer systems in order to study their nonlinear properties for the optical limiting in the near infrared part of the electromagnetic spectrum. Several polymers have been selected with specific properties, such as a high transmittance (>80%) over a broad spectrum and a significant third order nonlinear susceptibility χ³. Poly(methyl methacrylate) (PMMA) is considered as the standard host polymer material because of its high transparency up to 1.6μm but also due to its good accessibility. However, to avoid some issues (e.g. exothermy of the polymerization and Tromsdorff-Norish effect during the radical polymerization) regarding the use of methyl methacrylate (MMA) and to improve the nonlinear properties like the nonlinear and damage thresholds, new polymers or hybrid systems have been synthesized. In the present work, a thermoset matrix is studied corresponding to a mix between a reactive oligomer and a monomer both with methacrylate functions. The use of an oligomer and a monomer with a high boiling temperature as precursors allows to prevent the monomer evaporation, resulting in the formation of bubbles in the final material, related to the reaction exotherm.

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