Journal
OPTICS EXPRESS
Volume 22, Issue 5, Pages 6165-6173Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.006165
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Funding
- National Research Foundation (NRF) of Korea
- Ministry of Education, Republic of Korea [2012R1A1B3000587]
- Industrial Strategic Technology Development Program (Development of actinic EUV mask inspection tool and multiple electron beam wafer inspection technology) [10039226]
- Ministry of Trade, Industry & Energy, Republic of Korea
- National Research Foundation of Korea [2012R1A1B3000587] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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
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