Abstract
ABSTRACT We propose and demonstrate a Fabry-Perot fiber-optic tip sensor for high-resolution refractive-index measurement. The sensor head consists of a short air cavity produced near the tip of a single-mode fiber by 157-nm laser micromachining. The external refractive index is determined from the maximum visibility of the interfere nce fringes in the reflection spectrum of the fiber. This sensor provides temperature-independent measureme nt of practically any refractive index larger than that of air and offers a refractive-index resolution of ~4×10 -5 in its linear operating range. The e xperimental data agree well with the theoretical results. 1. INTRODUCTION Fiber-optic refractive-index (RI) sensors, such as surface plasma resonance (SPR) RI sensors [1,2] , grating-based RI sensors [3-7] , and interferometric RI sensors [8-10] , have attracted considerable interest in recent years, because of their many excellent characteristics, including corrosion resistance, immunity to electromagnetic interference, high precision, etc., which are important for applications in areas like biomedical measuremen t and environmental pr otection. However, there are still some drawbacks that need to be overcome with these sensors. SPR RI sensors can offer advantages of high accuracy and real-time response
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