Passivation of black phosphorus saturable absorbers for reliable pulse formation of fiber lasers

Title
Passivation of black phosphorus saturable absorbers for reliable pulse formation of fiber lasers
Authors
송용원박기철나동수박기환
Keywords
black phosphorus; saturable absorber; ultrafast pulse laser; polydimethylsiloxane passivation; alumina passivation
Issue Date
2017-11
Publisher
Nanotechnology
Citation
VOL 28-475207-8
Abstract
Black phosphorus (BP) has attracted increasing attention due to its unique electrical properties. In addition, the outstanding optical nonlinearity of BP has been demonstrated in various ways. Its functionality as a saturable absorber, in particular, has been validated in demonstrations of passive mode-locked lasers. However, normally, the performance of BP is degraded eventually by both thermal and chemical damage in ambient conditions. The passivation of BP is the critical issue to guarantee a stable performance of the optical devices. We quantitatively characterized the mode-locked lasers operated by BP saturable absorbers with diversified passivation materials such as polydimethylsiloxane (PDMS) or Al2O3, considering the atomic structure of the materials, and therefore the hydro-permeability of the passivation layers. Unlike the BP layers without passivation, we demonstrated that the Al2O3-passivated BP layer was protected from the surface oxidation reaction in the long-term, and the PDMS-passivated one had a short-term blocking effect. The quantitative analysis showed that the time-dependent characteristics of the pulsed laser without passivation were changed with respect to the pulse duration, spectral width, and time-bandwidth product displaying 550 fs, 2.8 nm, and 0.406, respectively. With passivation, the changes were limited to <43 fs, <0.3 nm, and <0.012, respectively.
URI
http://pubs.kist.re.kr/handle/201004/66413
ISSN
0957-4484
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KIST Publication > Article
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