Abstract

A microhole array in a common single-mode fiber is fabricated by selective chemical etching of femtosecond- laser-induced fiber Bragg grating (FBG), which has a laser-modified region extending from the fiber core to the cladding–air boundary due to laser self-focusing. The shape and size of the orderly microhole on the fiber surface are controlled via changing conditions of FBG fabrication and chemical etching. A simultaneous sensing for surrounding refractive index and temperature is demonstrated by this microhole array FBG through measurement of the transmission power change and Bragg resonant wavelength shift.

© 2011 Optical Society of America

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