Passively Q-Switched 1.89-μm Fiber Laser Using a Bulk-Structured Bi2Te3 Topological Insulator

We experimentally demonstrate that a bulk-structured Bi 2 Te 3 topological insulator (TI) film deposited on a side-polished fiber can act as an effective Q-switch for a 1.89-μm laser. Our bulk-structured Bi 2 Te 3 TI film with a thickness of ~31 μm, was prepared using a mechanical exfoliation method...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2015-01, Vol.21 (1), p.31-36
Main Authors: Lee, Junsu, Jung, Minwan, Koo, Joonhoi, Chi, Cheolhwan, Lee, Ju Han
Format: Article
Language:English
Subjects:
Fiber lasers
Laser mode locking
Optical fiber communication
Optical fiber polarization
Pump lasers
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Summary:We experimentally demonstrate that a bulk-structured Bi 2 Te 3 topological insulator (TI) film deposited on a side-polished fiber can act as an effective Q-switch for a 1.89-μm laser. Our bulk-structured Bi 2 Te 3 TI film with a thickness of ~31 μm, was prepared using a mechanical exfoliation method, and the fabricated film was transferred onto a side-polished SM2000 fiber to form a fiberized saturable absorber based on evanescent field interaction. By incorporating the saturable absorber into a thulium (Tm)-holmium (Ho) co-doped fiber-based ring cavity, it is shown that Q-switched pulses with a minimum temporal width of ~1.71 μs can readily be produced at a wavelength of 1.89 μm. The output pulse repetition rate was tunable from ~35 to ~60 kHz depending on the pump power. The maximum output pulse energy was ~11.54 nJ at a pump power of 250 mW. The output performance of our laser is compared to that of the 1.98-μm Q-switched fiber laser based on a nanosheet-based Bi 2 Se 3 TI demonstrated previously by Luo et al.
ISSN:1077-260X
DOI:10.1109/JSTQE.2014.2329934