A femtosecond pulse fiber laser at 1935 nm using a bulk-structured Bi2Te3 topological insulator

Title
A femtosecond pulse fiber laser at 1935 nm using a bulk-structured Bi2Te3 topological insulator
Authors
정민완이준수구준회박재현송용원이관일이상배이주한
Keywords
Bi2Te3; Topological Insulator; femtosecond laser; 1935 nm
Issue Date
2014-04
Publisher
Optics express
Citation
VOL 22, NO 7, 7865-7874
Abstract
We experimentally demonstrate a femtosecond mode-locked, allfiberized laser that operates in the 2 μm region and that incorporates a saturable absorber based on a bulk-structured bismuth telluride (Bi2Te3) topological insulator (TI). Our fiberized saturable absorber was prepared by depositing a mechanically exfoliated, ~30 μm-thick Bi2Te3 TI layer on a side-polished optical fiber platform. The bulk crystalline structure of the prepared Bi2Te3 layer was confirmed by Raman and X-ray photoelectron spectroscopy measurements. The modulation depth of the prepared saturable absorber was measured to be ~20.6%. Using the saturable absorber, it is shown that stable, ultrafast pulses with a temporal width of ~795 fs could readily be generated at a wavelength of 1935 nm from a thulium/holmium co-doped fiber ring cavity. This experimental demonstration confirms that bulk structured, TI-based saturable absorbers can readily be used as an ultra-fast mode-locker for 2 μm lasers.
URI
http://pubs.kist.re.kr/handle/201004/50438
ISSN
10944087
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KIST Publication > Article
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