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Proceedings Paper

Long period grating inscribed by femtosecond laser for refractive index measurements in aqueous environments
Author(s): Luis Brito Melo; Farid Ahmed; Martin Jun; Peter Wild
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Paper 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.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842163 (7 November 2012); doi: 10.1117/12.970268
Show Author Affiliations
Luis Brito Melo, Univ. of Victoria (Canada)
Farid Ahmed, Univ. of Victoria (Canada)
Martin Jun, Univ. of Victoria (Canada)
Peter Wild, Univ. of Victoria (Canada)


Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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