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

Research output: Contribution to journalArticle

43 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 languageEnglish (US)
Pages (from-to)54-61
Number of pages8
JournalSensors
Volume11
Issue number1
DOIs
StatePublished - Jan 1 2011

Fingerprint

Mach-Zehnder interferometers
Ultrashort pulses
Lasers
fibers
Fibers
sensors
Sensors
Laser Therapy
Processing
Acetone
lasers
Air
Laser ablation
Light
visibility
Visibility
acetone
laser ablation
Temperature
Experiments

Keywords

  • Femtosecond laser
  • Fiber sensors
  • Mach-zehnder interferometer

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing. / Zhao, Longjiang; Jiang, Lan; Wang, Sumei; Xiao, Hai; Lu, Yongfeng; Tsai, Hai Lung.

In: Sensors, Vol. 11, No. 1, 01.01.2011, p. 54-61.

Research output: Contribution to journalArticle

Zhao, Longjiang ; Jiang, Lan ; Wang, Sumei ; Xiao, Hai ; Lu, Yongfeng ; Tsai, Hai Lung. / A high-quality Mach-Zehnder interferometer fiber sensor by femtosecond laser one-step processing. In: Sensors. 2011 ; Vol. 11, No. 1. pp. 54-61.
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