摘要
利用157 nm激光微加工技术在单模光纤的端面加工一个微槽,用一段光纤将其密封形成一个空气珐-珀腔,这段密封用光纤与两侧的空气界面形成第二个珐-珀腔,传感器干涉条纹由两个珐-珀腔共同作用而成。计算表明,当两珐-珀腔长度接近时,传感器反射光谱的波谷位置会随着外界折射率变化而发生漂移。这种双干涉腔结构提供了一种新的折射率测量方案。实验表明当外界折射率在1.333 3～1.471 2内变化时,响应为非线性,平均灵敏度为28.21 nm/RIU,系统折射率分辨率为3.54×10^(-5),与理论计算吻合。
A micro trough is fabricated on the end of a single mode fiber by 157nm laser micro-machining. A section of fiber is applied to seal the trough and a Fabry-Perot （F-P） cavity is generated. The two interfaces between the sealed fiber and the air form the second F-P. Calculation shows that the valley of the reflection spectrum changes with the variation of surrounding refractive index （RI） when the length of the two F-Ps is approximate. This dual interferometer cavities provide a new solution {or RI measurement. Experimental results show an average sensitivity of 28.21 nm/RIU and RI resolution of 3.54× 10 ^-5 tested in the range of 1. 333 3-1. 471 2, agreeing with the theoretical analysis.
出处
《光学与光电技术》
2009年第4期19-22,共4页
Optics & Optoelectronic Technology
基金
国家自然科学重点基金(60537040)资助项目
关键词
光纤光学
光纤珐-珀腔
激光微加工
折射率测量
fiber optics
fiber Fabry Perot
laser micro-machining
refractive index measurement
