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Femtosecond laser inscription of waveguides and Bragg gratings in transparent cyclic olefin copolymers

  • We report on a femtosecond laser based fabrication technique that enables simultaneous single-step generation of optical waveguides and Bragg gratings inside bulk cyclic olefin copolymers. Due to the nonlinear absorption of focused and spatially modulated laser radiation with a wavelength of 514 nm and a pulse duration of 450 fs, a modification concluding a refractive index shift increase inside the substrate can be achieved. A sophisticated characterization of the generated waveguides by means of an elaborate cut-back method reveals a maximum attenuation of 3.2 dB/cm. Additionally, a Mach-Zehnder interferometer is used to examine the waveguide’s refractive index profile. The integrated Bragg grating structures exhibit reflectivities up to 95 % and a spectral full width at half maximum of 288 pm, at a Bragg wavelength of 1582 nm, whereas the grating period can be deliberately chosen by adapting the fabrication parameters. Thus, due to its increased flexibility and the resulting dispensability of cost-intensive phase masks, this method constitutes an especially promising fabrication process for polymer Bragg gratings inside of bulk materials.
Metadaten
Author:Gian-Luca Roth, Steffen HesslerORCiD, Stefan KeferORCiD, Maiko Girschikofsky, Cemal Esen, Ralf HellmannORCiD
DOI:https://doi.org/10.1364/OE.388364
Parent Title (English):Optics Express
Document Type:Article
Language:English
Year of Completion:2020
Release Date:2020/09/24
GND Keyword:Femtosekundenlaser; Wellenleiter; Bragg-Reflektor
Volume:28
Issue:12
First Page:18077
Last Page:18084
Urheberrecht:0
research focus :Intelligent Systems / Intelligent Sensors and Signals
Materials / Innovative Material Processing
Materials / Material Testing & Sensor Technology
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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