UV-Inscribed optical fiber gratings in Mid-IR range and their laser applications

Zhongyuan Sun*, Zhijun Yan, Kaiming Zhou, Qizhen Sun, Abdulyezir Ayomipo Badmos, Lin Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have UV-inscribed fiber Bragg gratings (FBGs), long-period gratings (LPGs), and tilted fiber gratings (TFGs) into mid-IR 2μm range using three common optical fiber grating fabrication techniques (two-beam holographic, phase mask, and point-by-point). The fabricated FBGs have been evaluated for thermal and strain response. It has been revealed that the FBG devices with responses in mid-IR range are much more sensitive to temperature than that in near-IR range. To explore the unique cladding mode coupling function, we have investigated the thermal and refractive index sensitivities of LPGs and identified that the coupled cladding modes in mid-IR range are also much more sensitive to temperature and surrounding medium refractive index change. The 45° tilted fiber gratings (45°-TFGs) as polarizing devices in mid-IR have been investigated for their polarization extinction characteristics. As efficient reflection filters and in-cavity polarizers, the mid-IR FBGs and 45°-TFGs have been employed in fiber laser cavity to realize multi-wavelength 2 μm Tm-doped CW and mode locked fiber lasers, respectively.

Original languageEnglish
Pages (from-to)328-342
Number of pages15
JournalJournal of Electronic Science and Technology
Issue number4
Publication statusPublished - Dec 2015


  • fiber Bragg grating
  • long period grating
  • mid-IR fiber lasers
  • tilted fiber grating


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