Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7081
Title: Highly refractive index sensitive femtosecond laser inscribed long period gratings
Authors: Kalli, Kyriacos 
Davies, Edward M. 
Zhang, Lin 
Koutsides, Charalambos 
Keywords: Femtosecond lasers
Refractive index
Optical fibers
Refractometers
Issue Date: 2011
Publisher: Spie Digital Library
Source: 21st International Conference on Optical Fiber Sensors;ON;15 -19 May 2011,Ottawa
Abstract: 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.
URI: http://ktisis.cut.ac.cy/handle/10488/7081
DOI: 10.1117/12.885993
Rights: © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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