DocumentCode
1511154
Title
Morphology and Thermal Stability of Fiber Bragg Gratings for Sensor Applications Written in 
-Free and  femtosecond laser radiation with a phase mask have been investigated in terms of their axial and cross-sectional morphology. It was found that Type I-IR and Type II-IR refractive index changes existed simultaneously in a single grating (which is termed a hybrid grating in this paper) written in either H<sub>2</sub>-free or H<sub>2</sub>-loaded fiber. The proportion of the two types of refractive index changes is a key factor in determining the thermal stability of the grating and spectral properties such as cladding mode coupling and polarization dependent loss (PDL). High-pressure molecular hydrogen loading (H<sub>2</sub> loading) can dramatically enhance the efficiency of grating inscription while preventing the laser-induced damage, due to the enhanced color center formation and the suppressed multiphoton ionization (MPI). The H<sub>2</sub> -loaded fiber Bragg gratings thus exhibit spectral properties and annealing behavior which is distinguishable from the H<sub>2</sub>-free gratings. The findings of this work are of particular importance in the design of optical fiber sensors which can operate at very high temperatures for prolonged periods and thus can have important uses in industry.</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Keywords</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>Bragg gratings; annealing; fibre optic sensors; high-speed optical techniques; hydrogen; laser beams; optical fibre cladding; optical fibre couplers; optical fibre fabrication; optical fibre losses; optical fibre polarisation; refractive index; thermal stability; H<sub>2</sub>; SMF-28 fiber; annealing; cladding mode coupling; cross-sectional morphology; fiber Bragg gratings; high-pressure molecular hydrogen loading; infrared femtosecond laser radiation; multiphoton ionization; optical fiber sensors; phase mask; polarization dependent loss; refractive index; sensor applications; thermal stability; Bragg gratings; Fiber gratings; Fiber lasers; Image sensors; Morphology; Optical fiber polarization; Refractive index; Solid lasers; Thermal sensors; Thermal stability; Femtosecond laser; fiber Bragg grating (FBG); high-temperature sensor; hybrid grating;</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>fLanguage</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>English</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Journal_Title</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>Sensors Journal, IEEE</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Publisher</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>ieee</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>ISSN</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>1530-437X</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Type</span></div><div class='col-12 col-md-9 leftDirection leftAlign'><h2 class='mb-0 fw-semibold'>jour</h2></div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>DOI</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>10.1109/JSEN.2010.2049102</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Filename</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>5482095</div></div>
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<div class='row g-0 align-items-center'><div class='col-12 col-md-3 fw-bold mb-2 mb-md-0'><span class='text-muted small'>Link To Document</span></div><div class='col-12 col-md-9 leftDirection leftAlign'><a class='text-break' href='https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1511154' target='_blank' rel=)
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