Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 100081, China.
Opt Lett. 2011 Oct 1;36(19):3753-5. doi: 10.1364/OL.36.003753.
A high-temperature sensor based on a Mach-Zehnder interferometer (MZI) in a conventional single-mode optical fiber is proposed and fabricated by concatenating two microcavities separated by a middle section. A femtosecond laser is used to fabricate a microhole on the center of a fiber end. Then a micro-air-cavity is formed by splicing the microholed fiber end with a normal fiber end. The interferometer is applied for high-temperature sensing, in the range of 500-1200 °C, with a sensitivity of 109 pm/°C that, to the best of our knowledge, is highest in silica fiber temperature sensors. Also, the interferometer is insensitive to external refractive index (RI), which is desirable for temperature sensors.
提出并制作了一种基于传统单模光纤中马赫-曾德尔干涉仪（MZI）的高温传感器，该传感器由两段微腔通过中间部分连接而成。采用飞秒激光在光纤端中心制作微孔。然后，通过将微孔光纤端与普通光纤端熔接，形成微空气腔。该干涉仪可用于 500-1200°C 的高温传感，灵敏度为 109 pm/°C，据我们所知，这在石英光纤温度传感器中是最高的。此外，该干涉仪对外界折射率（RI）不敏感，这是温度传感器所期望的。
