High-finesse micro-lens fiber-optic extrinsic Fabry–Perot interferometric sensors

Abstract

Micro-lenses are produced on two mirror-coated fiber ends in an extrinsic Fabry–Perot interferometer (EFPI) by curing epoxy droplets to obtain a high-finesse resonator. The high-finesse resonator is easy to construct, and can be used as a highly sensitive sensor at a low cost. The experimental results show that a temperature resolution of 0.025 °C and a strain resolution of 0.0625 µe can be achieved with such an EFPI.