Fringe visibility enhanced Fabry-Perot interferometer and its application as gas refractometer

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• 作者：Ruohui Wang ; ^{rwang@nwu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhangwen LiuAuthor Vitae ; Xueguang QiaoAuthor Vitae
• 关键词：Optical fiber devices ; Fabry-Perot interferometers ; Refractive index measurement
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：29 October 2016
• 年：2016
• 卷：234
• 期：Complete
• 页码：498-502
• 全文大小：1127 K

文摘

In this paper, we propose a gas refractometer based on a fringe visibility enhanced optical fiber Fabry-Perot interferometer. The Fabry-Perot cavity is fabricated by cascading single mode fiber and capillary tubes with different inner diameters. Gas can enter and leave the cavity freely through the hole of the capillary tube. A graded index fiber based collimator is inserted in between the single mode fiber and capillary tube to compensate the light loss and improve the fringe visibility. The numerical simulation and experiment results of Fringe visibility enhancement are presented. Gas refractive index measurement using the proposed interferometer is also demonstrated.