摘要
We propose and experimentally demonstrate a novel approach to measure the Era＋ concentration in Er^3＋ -doped silica fiber by fiber Bragg grating Fabry-Perot （FBG-FP） cavity ring-down spectrum. The relation- ship between the cavity ring-down time and the Era＋-doped concentration is derived. The results demonstrate that the cavity ring-down time is a function of the temperature of FBG, and an Er^3＋-doped concentration of 0.3 × 10^25m^-3 at the FBG operation temperature of 25℃ is obtained, which is consistent with the commercial Er^3＋-doped silica fiber parameter. The results obtained have theoretical guidance and develop a new method to measure the ion doped concentration in solid matter.
We propose and experimentally demonstrate a novel approach to measure the Era＋ concentration in Er^3＋ -doped silica fiber by fiber Bragg grating Fabry-Perot （FBG-FP） cavity ring-down spectrum. The relation- ship between the cavity ring-down time and the Era＋-doped concentration is derived. The results demonstrate that the cavity ring-down time is a function of the temperature of FBG, and an Er^3＋-doped concentration of 0.3 × 10^25m^-3 at the FBG operation temperature of 25℃ is obtained, which is consistent with the commercial Er^3＋-doped silica fiber parameter. The results obtained have theoretical guidance and develop a new method to measure the ion doped concentration in solid matter.
