CAP - Indexed Articles in Conferences

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    Characterization of Femtosecond Laser Direct Written Mach-Zehnder Interferometers Based on Titanium Dioxide Coated Long Period Fiber Gratings
    ( 2020) Carlos Duarte Viveiros ; Vasconcelos,H ; De Almeida,JMMM ; Coelho,L ; Amorim,VA ; João Miguel Maia ; Jorge,PAS ; Marques,PVS ; 5872 ; 6596
    Optical fiber Mach-Zehnder interferometers were fabricated by combining two TiO2 coated LPFGs fabricated through femtosecond laser direct writing. Results of its refractometric characterization are presented and compared with the single LPFGs sensors. Wavelength sensitivity of 1175 nm/RIU at 1.38 and spectral resolution of 2.2×10-5 were achieved. © 2021 The Author(s).
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    Off-axis Fiber Bragg Grating Fabricated by Femtosecond Laser Direct Writing for Torsion Sensing
    ( 2020) Carlos Duarte Viveiros ; De Almeida,JMMM ; Coelho,L ; João Miguel Maia ; Amorim,VA ; Jorge,PAS ; Marques,PVS ; 5872 ; 6596
    The precise production of 4.5 µm off-axis first order FBG in an SMF-28e fiber through femtosecond laser direct writing is demonstrated. The off-axis FBG potential as sensing head for torsion sensing was successfully explored. © 2021 The Author(s).
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    Femtosecond Laser Direct Writing of Turn Around Point Long Period Fiber Gratings Coated with Titanium Dioxide for Improved Sensitivity
    ( 2020) Carlos Duarte Viveiros ; De Almeida,JMMM ; Luís Carlos Coelho ; Vasconcelos,H ; João Miguel Maia ; Amorim,VA ; Pedro Jorge ; Paulo Vicente Marques ; 3565 ; 4287 ; 5256 ; 5872 ; 6596
    The fabrication of Turn Around Point Long Period Fiber Grating in standard SMF-28e fibers through femtosecond laser direct writing is demonstrated and its sensing sensitivity is improved by coating the fiber with titanium dioxide through physical vapor deposition. © 2021 The Author(s).
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    Loss mechanisms in femtosecond laser written optical waveguides
    ( 2021) Paulo Vicente Marques ; Amorim,VA ; João Miguel Maia ; Carlos Duarte Viveiros ; 4287 ; 5872 ; 6596
    Low loss optical waveguides are the key component for the fabrication of more complex integrated optics devices. In most works related to femtosecond laser written waveguides, the values presented give results at a single wavelength or in a narrow wavelength band; but some applications in optical sensing, for example, would benefit from waveguides having good propagation properties in a larger wavelength range. This paper presents results that allow one to gain insight into the major loss mechanisms present in laser written waveguides in two different types of glasses (fused silica and Eagle 2000 glass) and the dependence of those on the fabrication parameters. Finally, an example of application of broadband operating waveguides is given.
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    Femtosecond laser micromachining of Fabry-Perot interferometers in SMF-28 fiber for pressure sensing (Conference Presentation)
    ( 2020) Carlos Duarte Viveiros ; José Almeida ; Luís Carlos Coelho ; João Miguel Maia ; Amorim,VA ; Vasconcelos,H ; Pedro Jorge ; Paulo Vicente Marques ; 5256 ; 5799 ; 5872 ; 6596 ; 3565 ; 4287