Long period grating inscribed by femtosecond laser for refractive index measurements in aqueous environments

Luis Brito Melo; Farid Ahmed; Martin Jun; Peter Wild

doi:10.1117/12.970268

7 November 2012 Long period grating inscribed by femtosecond laser for refractive index measurements in aqueous environments

Luis Brito Melo, Farid Ahmed, Martin Jun, Peter Wild

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842163 (2012) https://doi.org/10.1117/12.970268
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A sensor based on a Long Period Grating (LPG) for measurement of the refractive index (RI) of liquids with RI close to that of water is reported. An LPG was written by a femtosecond laser (F-LPG) operating at 800nm, utilizing a point-bypoint technique. The performance of the F-LPG is compared with an LPG written by ultraviolet irradiation (UV-LPG). For low RIs, the sensitivities of the F-LPG and UV-LPG are 130 nm/RIU and 3.1 nm/RIU, respectively. For higher RI, the F-LPG exhibited sensitivity as high as 249 nm/RIU. For the low range of RI, the resolution of F-LPG was 3.8 x 10^-5.

Citation Download Citation

Luis Brito Melo, Farid Ahmed, Martin Jun, and Peter Wild "Long period grating inscribed by femtosecond laser for refractive index measurements in aqueous environments", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842163 (7 November 2012); https://doi.org/10.1117/12.970268

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