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Title: Characterisation of femtosecond laser inscribed long period gratings in photonic crystal fibre
Authors: Allsop, Thomas P. 
Kalli, Kyriacos 
Zhou, Kaiming 
Smith, Graham N. 
Lai, Yicheng 
Dubov, Michael 
Sugden, Kate 
Webb, David J. 
Bennion, Ian 
Komodromos, Michael 
metadata.dc.contributor.other: Καλλή, Κυριάκος
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Fiber Bragg gratings;Photonic crystals
Issue Date: Apr-2008
Source: Proceedings of SPIE - The International Society for Optical Engineering, 6990, art. no. 69900I
Conference: Photonic Crystal Fibers II 
Abstract: The 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.
ISBN: 978-081947188-8
ISSN: 0277-786X
DOI: 10.1117/12.781104
Rights: © 2008 SPIE--The International Society for Optical Engineering
Type: Conference Papers
Affiliation : Aston University 
Cyprus University of Technology 
Frederick Research Center 
Appears in Collections:Δημοσιεύσεις σε συνέδρια /Conference papers or poster or presentation

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