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1 Department of Photonics Engineering, Technical University of Denmark 2 Fiber Sensors and Supercontinuum Generation, Department of Photonics Engineering, Technical University of Denmark 3 Aston University 4 Aston University
In this Letter, we provide evidence suggesting that the main photosensitive mechanism of an undoped poly(methyl methacrylate)-based microstructured optical fiber under UV radiation at 325 nm is a competitive process of both photodegradation and polymerization. We found experimentally that increasing strain during photo-inscription leads to an increased photosensitivity, which is evidence of photodegradation. Likewise, refractive index change in the fiber was measured to be positive, which provides evidence for further polymerization of the material. Finally, we relate the data obtained to the spatial recording resolution of the samples. © 2014 Optical Society of America.
Optics Letters, 2014, Vol 39, Issue 12, p. 3421-3424
Esters; Light sensitive materials; Optical fibers; Photosensitivity; Polymerization; Ultraviolet radiation; Micro-structured optical fibers; Recording resolution; Refractive index changes; Spatial resolution; Acrylic monomers
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