Measuring glass transition of a polymer coating layer over working fiber using forward Brillouin scattering

Alon Bernstein, Elad Zehavi, Yosef London, Mirit Hen, Andrei A. Stolov, Avi Zadok

Research output: Contribution to journalArticlepeer-review

Abstract

The glass transition temperature is a key parameter of polymer coating layers that protect optical fibers, and it affects the proper function of the fibers in their service environment. Established protocols for glass transition temperature measurements are destructive, require samples of specific geometries, and may only be carried out offline. In this work, we report the nondestructive measurement of the glass transition temperature of an acrylate polymer coating layer over a working standard fiber. The method is based on forward stimulated Brillouin scattering. A large decrease in the modulus of the coating layer above the glass transition temperature manifests in the narrowing of the modal linewidths in the forward Brillouin scattering spectrum. The transition temperature agrees with the standard dynamic mechanical analysis of samples made of the same polymer. The protocol can be useful for coating materials research and development, production line quality assurance, and preventive maintenance.

Original languageEnglish
Pages (from-to)5037-5040
Number of pages4
JournalOptics Letters
Volume48
Issue number19
DOIs
StatePublished - 1 Oct 2023

Bibliographical note

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© 2023 Optica Publishing Group.

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