Femtosecond laser fabrication of long period fiber gratings and applications in refractive index sensing

Benye Li, Lan Jiang*, Sumei Wang, Hai Lung Tsai, Hai Xiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)

Abstract

An improved point-by-point inscription method is proposed to fabricate long period fiber gratings (LPFGs) by using a laser operating at 800 nm with 35 fs duration pulses. The sensitivity to misalignment between the core and the focus is reduced by scanning a rectangular part on the fiber. LPFGs with an attenuation depth of 20 dB are achieved within the wavelength range of 14651575 nm. Characterization of the temperature sensitivity and thermal stability of the LPFGs is presented. A 5.6 nm wavelength shift and a 1.2 dB decrease in the attenuation peak are observed following heat treatment at 600 °C for 4 h. The fabricated LPFGs are used as refractive index sensors. The effect of heat treatment on the response of the LPFGs to refractive index changes is also studied.

Original languageEnglish
Pages (from-to)1420-1423
Number of pages4
JournalOptics and Laser Technology
Volume43
Issue number8
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Femtosecond laser
  • Long period fiber gratings
  • Refractive index sensor

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