Characterization of Polymer Fiber Bragg Grating With Ultrafast Laser Micromachining

We report that the main photosensitive mechanism of poly(methyl methacrylate)-based optical fiber Bragg grating (POFBG) under ultraviolet laser micromachining is a complex process of both photodegradation and negative thermo-optic effect. We found experimentally the unique characteristics of Bragg r...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-07, Vol.28 (13), p.1450-1453
Main Authors: Chen Liu, Cardoso, Marcos R., Wei Zhang, Xianfeng Chen
Format: Article
Language:English
Subjects:
Bragg grating
Bragg gratings
Fiber gratings
fiber optics
fiber sensor
Fibers
Laser beams
Laser machining
Micromachining
Optical fibers
Photodegradation
photosensitivity
PMMA
polymer optical fiber
Polymers
Polymethyl methacrylates
Refractive index
Refractivity
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Summary:We report that the main photosensitive mechanism of poly(methyl methacrylate)-based optical fiber Bragg grating (POFBG) under ultraviolet laser micromachining is a complex process of both photodegradation and negative thermo-optic effect. We found experimentally the unique characteristics of Bragg resonance splitting and reunion during the laser micromachining process providing the evidence of photodegradation, while the mean refractive index change of POFBG was measured to be negative confirming further photodegradation of polymer fiber. The thermal-induced refractive index change of POFBG was also observed by recording the Bragg wavelength shift. Furthermore, the dynamic thermal response of the micromachined-POFBG was demonstrated under constant humidity, showing a linear and negative response of around -47.1 pm/°C.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2554200