Highly refractive index sensitive femtosecond laser inscribed long period gratings


The distinct behaviour of femtosecond laser inscribed long period gratings, with a non-uniform index perturbation within the optical fibre core, has been studied experimentally. The non-uniform laser-induced perturbation results in light coupling from the core mode to a greater number of cladding modes than is the case with their UV laser inscribed counterparts, and this is made evident from the surrounding refractive index (SRI) grating response. Femtosecond inscribed long period gratings are shown to simultaneously couple to multiple sets of cladding modes. A 400μm LPG is shown to result in attenuation peaks that have both blue and red wavelength shifts over a 1250nm to 1700nm wavelength range. This gives rise to SRI sensitivities far greater than anything achievable by monitoring a single attenuation peak. The maximum sensitivity produced by monitoring a single attenuation peak was 1106nm/RIU, whereas monitoring opposing wavelength shifts resulted in a significantly improved sensitivity of 1680nm/RIU.

Publication DOI: https://doi.org/10.1117/12.885993
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: Edward Davies; Kyriacos Kalli; Charalambos Koutsides and Lin Zhang, "Highly refractive index sensitive femtosecond laser inscribed long period gratings", 21st International Conference on Optical Fiber Sensors, eds. Wojtek J. Bock; Jacques Albert; Xiaoyi Bao, Proc. SPIE 7753, 77539H (2011). Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.885993
Event Title: 21st International Conference on Optical Fiber Sensors
Event Type: Other
Event Dates: 2011-05-15 - 2011-05-19
Uncontrolled Keywords: femtosecond laser,long period grating,refractive index,Applied Mathematics,Computer Science Applications,Electrical and Electronic Engineering,Electronic, Optical and Magnetic Materials,Condensed Matter Physics
ISBN: 978-0-8194-8246-4
Full Text Link: http://proceedi ... ticleid=1347152
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Conference contribution
Published Date: 2011-05-17
Authors: Davies, Edward
Kalli, Kyriacos
Koutsides, Charalambos
Zhang, Lin ( 0000-0002-1691-5577)



Version: Published Version

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