Sucrose refractive index sensing characterization of laser processed optical fiber Fabry-Perot micro-cavity

In this paper, a Fabry-Perot micro-cavity sensor have been successfully fabricated by femtosecond laser. The optimal etching parameters of Fabry-Perot micro-cavity are obtained. Length of Fabry-Perot micro-cavity is between 45 pm and 60 pm, height of Fabry-Perot micro-cavity is between 70 pm and 75 pm, and inclined angle of phi is less than 1.3 degrees. The sensor exhibits better sucrose refractive index sensitivity of-30.69 dB/RIU and linearity of 98.7%. After using CL3-AMW method and improved data fusion algorithm, the sensitivity of sucrose refractive index attains-31.98 dB/RIU and linearity increases to 99.58%. The sensing performance of optical fiber Fabry-Perot micro-cavity is effective.