Thermo-Optic Tuning in an Optical Fiber Ring Laser With a Nematic Liquid Crystal Film-Embedded Sagnac Interferometer
IEEE Sensors Journal(2023)
摘要
Nematic liquid crystal (NLC) has been widely researched in temperature sensors because of its large negative temperature coefficient and unique optical anisotropy. In this article, a tunable temperature sensor based on an optical fiber ring laser (FRL) with an NLC film-embedded Sagnac interferometer (SI) was experimentally studied. By filling NLC film into a gap with hundreds of microns thick in the SI, a tunable and high spacial resolution temperature sensor was achieved. Compared to the traditional SI, the resultant sensor based on FRL with an NLC film-embedded SI in it showed a narrow 3 dB bandwidth and an ultrahigh resolution (
${R}{)}$
. At the NLC film thickness of
$288.21 ~\mu \text{m}$
, the temperature sensitivity [
${S}{(}{t}{)}$
], detection limit (DL), and quality factor (
${Q}{)}$
of the resultant sensor were −3.16 nm/°C,
$- 5.38\times 10^{-{3}}\,\,^{\circ }\text{C}$
, and
$6.99\times 10^{{3}}$
, respectively. Experimental results also indicated that the temperature sensing characteristic could be further improved by shortening the thickness of the NLC film. This kind of sensor, which shows high
${R}$
and DL has great application potential in temperature monitoring in biomedicine, environmental monitoring, agricultural engineering, health monitoring, and aerospace.
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关键词
optical fiber ring laser,optical fiber,thermo-optic,film-embedded
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