A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing

Longjiang Zhao; Lan Jiang; Sumei Wang; Hai Xiao; Yongfeng Lu; Hai Lung Tsai

doi:10.3390/s110100054

A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing

Longjiang Zhao, Lan Jiang, Sumei Wang, Hai Xiao, Yongfeng Lu, Hai Lung Tsai

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

During new fiber sensor development experiments, an easy-to-fabricate simple sensing structure with a trench and partially ablated fiber core is fabricated by using an 800 nm 35 fs 1 kHz laser. It is demonstrated that the structure forms a Mach-Zehnder interferometer (MZI) with the interference between the laser light passing through the air in the trench cavity and that in the remained fiber core. The fringe visibilities are all more than 25 dB. The transmission spectra vary with the femtosecond (fs) laser ablation scanning cycle. The free spectral range (FSR) decreases as the trench length increases. The MZI structure is of very high fabrication and sensing repeatability. The sensing mechanism is theoretically discussed, which is in agreement with experiments. The test sensitivity for acetone vapor is about 10⁴ nm/RIU, and the temperature sensitivity is 51.5 pm/°C at 200 ~ 875 °C with a step of 25 °C.

Original language	English
Pages (from-to)	54-61
Number of pages	8
Journal	Sensors
Volume	11
Issue number	1
DOIs	https://doi.org/10.3390/s110100054
Publication status	Published - Jan 2011

Keywords

Femtosecond laser
Fiber sensors
Mach-zehnder interferometer

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10.3390/s110100054

Cite this

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title = "A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing",

abstract = "During new fiber sensor development experiments, an easy-to-fabricate simple sensing structure with a trench and partially ablated fiber core is fabricated by using an 800 nm 35 fs 1 kHz laser. It is demonstrated that the structure forms a Mach-Zehnder interferometer (MZI) with the interference between the laser light passing through the air in the trench cavity and that in the remained fiber core. The fringe visibilities are all more than 25 dB. The transmission spectra vary with the femtosecond (fs) laser ablation scanning cycle. The free spectral range (FSR) decreases as the trench length increases. The MZI structure is of very high fabrication and sensing repeatability. The sensing mechanism is theoretically discussed, which is in agreement with experiments. The test sensitivity for acetone vapor is about 104 nm/RIU, and the temperature sensitivity is 51.5 pm/°C at 200 ~ 875 °C with a step of 25 °C.",

keywords = "Femtosecond laser, Fiber sensors, Mach-zehnder interferometer",

author = "Longjiang Zhao and Lan Jiang and Sumei Wang and Hai Xiao and Yongfeng Lu and Tsai, {Hai Lung}",

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T1 - A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing

AU - Zhao, Longjiang

AU - Jiang, Lan

AU - Wang, Sumei

AU - Xiao, Hai

AU - Lu, Yongfeng

AU - Tsai, Hai Lung

PY - 2011/1

Y1 - 2011/1

N2 - During new fiber sensor development experiments, an easy-to-fabricate simple sensing structure with a trench and partially ablated fiber core is fabricated by using an 800 nm 35 fs 1 kHz laser. It is demonstrated that the structure forms a Mach-Zehnder interferometer (MZI) with the interference between the laser light passing through the air in the trench cavity and that in the remained fiber core. The fringe visibilities are all more than 25 dB. The transmission spectra vary with the femtosecond (fs) laser ablation scanning cycle. The free spectral range (FSR) decreases as the trench length increases. The MZI structure is of very high fabrication and sensing repeatability. The sensing mechanism is theoretically discussed, which is in agreement with experiments. The test sensitivity for acetone vapor is about 104 nm/RIU, and the temperature sensitivity is 51.5 pm/°C at 200 ~ 875 °C with a step of 25 °C.

AB - During new fiber sensor development experiments, an easy-to-fabricate simple sensing structure with a trench and partially ablated fiber core is fabricated by using an 800 nm 35 fs 1 kHz laser. It is demonstrated that the structure forms a Mach-Zehnder interferometer (MZI) with the interference between the laser light passing through the air in the trench cavity and that in the remained fiber core. The fringe visibilities are all more than 25 dB. The transmission spectra vary with the femtosecond (fs) laser ablation scanning cycle. The free spectral range (FSR) decreases as the trench length increases. The MZI structure is of very high fabrication and sensing repeatability. The sensing mechanism is theoretically discussed, which is in agreement with experiments. The test sensitivity for acetone vapor is about 104 nm/RIU, and the temperature sensitivity is 51.5 pm/°C at 200 ~ 875 °C with a step of 25 °C.

KW - Femtosecond laser

KW - Fiber sensors

KW - Mach-zehnder interferometer

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A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing

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Keywords

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