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A high sensitivity refractometer based upon a long period grating Mach–Zehnder interferometer

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5 Author(s)
Allsop, T. ; Photonics Research Group, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom ; Reeves, R. ; Webb, D.J. ; Bennion, I.
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A low cost interrogation scheme is demonstrated for a refractometer based on an in-line fiber long period grating (LPG) Mach–Zehnder interferometer. Using this interrogation scheme the minimum detectable change in refractive index of Δn∼1.8×10-6 is obtained, which is the highest resolution achieved using a fiber LPG device, and is comparable to precision techniques used in the industry including high performance liquid chromatography and ultraviolet spectroscopy. © 2002 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:73 ,  Issue: 4 )