Lee, Junsu Koo, Joonhoi Jhon, Young Min Lee, Ju Han 2024-01-20T10:04:11Z 2024-01-20T10:04:11Z 2021-09-05 2014-03 1094-4087 https://pubs.kist.re.kr/handle/201004/127001 We experimentally demonstrate the use of a bulk-structured Bi2Te3 topological insulator (TI) as an ultrafast mode-locker to generate femtosecond pulses from an all-fiberized cavity. Using a saturable absorber based on a mechanically exfoliated layer about 15 mu m thick deposited onto a side-polished fiber, we show that stable soliton pulses with a temporal width of similar to 600 fs can readily be produced at 1547 nm from an erbium fiber ring cavity. Unlike previous TI-based mode-locked laser demonstrations, in which high-quality nanosheet-based TIs were used for saturable absorption, we chose to use a bulk-structured Bi2Te3 layer because it is easy to fabricate. We found that the bulk-structured Bi2Te3 layer can readily provide sufficient nonlinear saturable absorption for femtosecond mode-locking even if its modulation depth of similar to 15.7% is much lower than previously demonstrated nanosheet-structured TI-based saturable absorbers. This experimental demonstration indicates that high-crystalline-quality atomic-layered films of TI, which demand complicated and expensive material processing facilities, are not essential for ultrafast laser mode-locking applications. (C) 2014 Optical Society of America English Optical Society of America A femtosecond pulse erbium fiber laser incorporating a saturable absorber based on bulk-structured Bi2Te3 topological insulator Article 10.1364/OE.22.006165 1 Optics Express, v.22, no.5, pp.6165 - 6173 Optics Express 22 5 6165 6173 N scie scopus 000333579200166 2-s2.0-84896359004 Optics Optics Article GRAPHENE OXIDE GENERATION BI2SE3 STATE EXFOLIATION fiber laser mode-locked nonlinear