Title :
Optical Fiber Cavity Ring Down Measurement of Refractive Index With a Microchannel Drilled by Femtosecond Laser
Author :
Zhou, Kaiming ; Webb, David J. ; Mou, Chengbo ; Farries, Mark ; Hayes, Neil ; Bennion, Ian
Author_Institution :
Photonic Res. Group, Aston Univ., Birmingham, UK
Abstract :
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.
Keywords :
gels; laser cavity resonators; measurement by laser beam; micro-optomechanical devices; microfabrication; optical fibre couplers; optical fibre fabrication; refractive index measurement; spectroscopy; cavity ring down spectroscopy; femtosecond laser; fiber loop; gels; laser spectroscopy; microchannel; optical fiber cavity ring down measurement; refractive index measurement; size 10 m; Biomedical optical imaging; Fiber lasers; Microchannel; Optical fiber couplers; Optical fibers; Optical refraction; Optical sensors; Refractive index; Ring lasers; Ultrafast optics; Cavity ring down; femtosecond laser; micromachining; optical fiber;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2031244
