Chah Karima, Chapalo Ivan, Nan Ying-Gang, Kinet Damien, Mégret Patrice, Caucheteur Christophe
Opt Lett. 2021 Sep 1;46(17):4272-4275. doi: 10.1364/OL.436249.
We report the inscription of highly reflective fiber Bragg gratings in perfluorinated polymer (CYTOP) optical fibers using 800 nm femtosecond pulses and a line-by-line inscription method. We demonstrate that the energy for grating inscription without damage is below 27 nJ. After the writing process, we show that the grating reflectivity continues to rise for several hours. The obtained gratings show reflectivity degradation with temperature increase, while the Bragg wavelength undergoes a linear temperature dependence of 37.7 pm/°C when the humidity is controlled and the heating/cooling rate is relatively low (≤0.14/). The humidity sensitivity at a fixed temperature (25°C) is 22.3 pm/%RH. Finally, the axial strain sensitivity is determined to be 1.35 pm/µɛ.
我们报道了使用800纳米飞秒脉冲和逐行写入方法在全氟聚合物（CYTOP）光纤中写入高反射率光纤布拉格光栅。我们证明，无损写入光栅的能量低于27纳焦。写入过程后，我们发现光栅反射率会持续上升数小时。所获得的光栅显示出反射率随温度升高而下降，而当湿度得到控制且加热/冷却速率相对较低（≤0.14/）时，布拉格波长呈现出37.7皮米/°C的线性温度依赖性。在固定温度（25°C）下的湿度灵敏度为22.3皮米/%RH。最后，确定轴向应变灵敏度为1.35皮米/微应变。
