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dc.contributor.authorAllsop, Thomas P.-
dc.contributor.authorKalli, Kyriacos-
dc.contributor.authorZhou, Kaiming-
dc.contributor.authorSmith, Graham N.-
dc.contributor.authorLai, Yicheng-
dc.contributor.authorDubov, Michael-
dc.contributor.authorSugden, Kate-
dc.contributor.authorWebb, David J.-
dc.contributor.authorBennion, Ian-
dc.contributor.authorKomodromos, Michael-
dc.contributor.otherΚαλλή, Κυριάκος-
dc.identifier.citationProceedings of SPIE - The International Society for Optical Engineering, 6990, art. no. 69900Ien_US
dc.description.abstractThe use of high intensity femtosecond laser sources for inscribing fibre gratings has attained significant interest. The principal advantage of high-energy pulses is their ability for grating inscription in any material type without pre-processing or special core doping - the inscription process is controlled multi-photon absorption, void generation and subsequent local refractive index changes. The formation of grating structures in photonics crystal fibre has proven difficult, as the presence of holes within the fibre that allow wave-guidance impair and scatter the femtosecond inscription beam. Here we report on the consistent manufacture of long period gratings in endlessly single mode microstructure fibre and on their characterisation to external perturbations. Long period gratings are currently the subject of considerable research interest due to their potential applications as filters and as sensing devices, responsive to strain, temperature, bending and refractive index. Compared to the more mature fibre Bragg grating sensors, LPGs have more complex spectra, usually with broader spectral features. On the other hand they are intrinsically sensitive to bending and refractive index. Perhaps more importantly, the fibre design and choice of grating period can have a considerable influence over the sensitivity to the various parameters, for example allowing the creation of a bend sensor with minimal temperature cross-sensitivity. This control is not possible with FBG sensors. Here we compare the effects of symmetric and asymmetric femtosecond laser inscription.en_US
dc.rights© 2008 SPIE--The International Society for Optical Engineeringen_US
dc.subjectFiber Bragg gratingsen_US
dc.subjectPhotonic crystalsen_US
dc.titleCharacterisation of femtosecond laser inscribed long period gratings in photonic crystal fibreen_US
dc.typeConference Papersen_US
dc.collaborationAston Universityen_US
dc.collaborationCyprus University of Technologyen_US
dc.collaborationFrederick Research Centeren_US
dc.subject.categoryElectrical Engineering - Electronic Engineering - Information Engineeringen_US
dc.countryUnited Kingdomen_US
dc.subject.fieldEngineering and Technologyen_US
dc.publicationPeer Revieweden_US
dc.relation.conferencePhotonic Crystal Fibers IIen_US
item.fulltextNo Fulltext-
item.grantfulltextnone- of Electrical Engineering, Computer Engineering and Informatics- of Engineering and Technology- of Engineering and Technology-
Appears in Collections:Δημοσιεύσεις σε συνέδρια /Conference papers or poster or presentation
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