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

作　　者：Jinho Lee Ju Han Lee 李珍昊;李周翰(School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, Republic of Korea)

机构地区：School of Electrical and Computer Engineering,University of Seoul,Seoul 02504,Republic of Kore

出　　处：《Chinese Physics B》2018年第9期137-143,共7页中国物理B（英文版）

基　　金：Project supported by the National Research Foundation of Korea(NRF)Grant Funded by the Korea Government(MSIT),Republic of Korea(Grant No.NRF-2018R1A2B6001641);Ministry of Science and ICT(MSIT)under the Information Technology Research Center(ITRC)Support Program(Grant No.IITP-2018-2015-0-00385);supervised by the Institute for Information and Communications Technology Promotion(IITP)

摘　　要：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 -28.6 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.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 -28.6 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.

关 键 词：topological insulator mode-locked lasers femtosecond pulse fiber lasers 

分 类 号：TN248[电子电信—物理电子学]