18 May 2011 Highly refractive index sensitive femtosecond laser inscribed long period gratings
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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77539H (2011) https://doi.org/10.1117/12.885993
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada
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.
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Edward Davies, Edward Davies, Kyriacos Kalli, Kyriacos Kalli, Charalambos Koutsides, Charalambos Koutsides, Lin Zhang, Lin Zhang, } "Highly refractive index sensitive femtosecond laser inscribed long period gratings", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539H (18 May 2011); doi: 10.1117/12.885993; https://doi.org/10.1117/12.885993
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