飞秒激光制备光纤微孔传感器

为了实现高精度、低成本的液体折射率测量,采用飞秒激光水辅助微加工技术,制备出一种基于微孔结构的单模光纤液体折射率传感器.研究了传感器的传输损耗与孔内液体折射率及微孔长度的关系,利用射线理论分析了传感的机理,讨论了温度对传感器性能的影响.结果表明,该传感器在折射率1.333～1.413区间具有良好的线性响应,灵敏度达到157.48dB/RIU,且不易受温度串扰.该传感器具有结构紧凑、制备简单、高灵敏度、温度不敏感和低成本等优点,在生物化学测量领域中有着广泛的应用前景.

Optical fiber micro-hole sensor fabricated with femtosecond laser

In order to measure refractive index of liquid with high-precision and low-cost,a liquid refractive index sensor based on a micro-hole in the single-mode fiber was fabricated by means of water-assisted femtosecond laser ablation method.The responses of transmission loss of the sensor to the refractive index and micro-hole length were investigated.Based on the ray theory,the sensing mechanism was analyzed.The effect of temperature disturbance on the sensor performance was also discussed.The experiment results show that the sensor has a good linear response in the refractive index range of 1.333~1.413,the sensitivity of the sensor can achieve 157.48dB/RIU and it is less susceptible to temperature change.Compared with other fiber refractive index sensors,optical fiber micro-hole sensors have the outstanding advantages,including compact,easy to fabricate,high sensitivity insensitive to temperature and low cost,etc.Therefore optical fiber micro-hole sensors can have extensive application in the fields of biochemical measurement.