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Optical Fiber Cavity Ring Down Measurement of Refractive Index With a Microchannel Drilled by Femtosecond Laser

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6 Author(s)
Kaiming Zhou ; Photonic Res. Group, Aston Univ., Birmingham, UK ; Webb, D.J. ; Chengbo Mou ; Farries, M.
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A microchannel was inscribed in the fiber of a ring cavity which was constructed using two 0.1% : 99.9% couplers and a 10-m fiber loop. Cavity ring down spectroscopy was used to measure the refractive index (RI) of gels infused into the microchannel. The ring down time discloses a nonlinear increase with respect to RI of the gel and sensitivity up to 300 mus/RI unit and an index resolution of 1.4 times10-4 was obtained.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 22 )