Femtosecond Tm-Ho co-doped fiber laser using a bulk-structured Bi2Se3 topological insulator

Jinho Lee, Ju Han Lee

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25 Scopus citations


We experimentally demonstrate a femtosecond mode-locked thulium-holmium (Tm-Ho) co-doped fiber laser incorporating a saturable absorber (SA) based on a bulk-structured bismuth selenide (Bi2Se3) topological insulator (TI). The SA was prepared by depositing a mechanically exfoliated Bi2Se3 TI layer onto a side-polished optical fiber platform. Unlike high-quality nano-structured Bi2Se3 TI-based SA, bulk-structured Bi2Se3 with non-negligible oxidation was used as a saturable absorption material for this experimental demonstration due to its easy fabrication process. The saturation power and modulation depth of the prepared SA were measured to be ∼8.6 W and ∼13.4%, respectively. By incorporating the prepared SA into a Tm-Ho co-doped fiber ring cavity, stable soliton pulses with a temporal width of ∼ 853 fs could be generated at 1912.12 nm. The 3-dB bandwidth of the mode-locked pulse was measured to be ∼4.87 nm. This experimental demonstration reaffirms that Bi2Se3 is a superb base material for mid-infrared passive mode-locking even under oxidation.

Original languageEnglish
Article number094219
JournalChinese Physics B
Issue number9
StatePublished - Sep 2018


  • Femtosecond pulse
  • Fiber lasers
  • Mode-locked lasers
  • Topological insulator


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