Abstract
The fabrication of tilted fiber Bragg gratings (TFBGs) in non-photosensitized
single-mode fiber by infrared femtosecond (fs) laser is reported for the first time to
the best of our knowledge. The tilted grating structure is obtained by focusing laser
pulses through a phase mask into a tilted positioned fiber sample, which is moving along
with the interference fringe to form a grating region covering the entire fiber core and
partial cladding. A reflective fiber probe based on the TFBG with a gold mirror
sputtered on one end has been fabricated and its maximum refractive index (RI)
sensitivity is 12.276 nm/RI unit in the RI range of 1.4091–1.4230 for the cladding mode
LP020. A wavelength-power demodulated technique based on the sensors has been proposed
to measure axial strain and temperature simultaneously, which is found suited to work in
harsh environment, especially at high temperature up to 800°C.
© 2012 IEEE
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