Stable mode-locked fiber laser based on CVD fabricated graphene saturable absorber

Optics Express
Pi Ling HuangWood-Hi Cheng

Abstract

A stable mode-locked fiber laser (MLFL) employing multi-layer graphene as saturable absorber (SA) is presented. The multi-layer graphene were grown by chemical vapor deposition (CVD) on Ni close to A-A stacking. Linear absorbance spectrum of multi-layer graphene was observed without absorption peak from 400 to 2000 nm. Optical nonlinearities of different atomic-layers (7-, 11-, 14-, and 21- layers) graphene based SA are investigated and compared. The results found that the thicker 21-layer graphene based SA exhibited a smaller modulation depth (MD) value of 2.93% due to more available density of states in the band structure of multi-layer graphene and favored SA nonlinearity. A stable MLFL of 21-layer graphene based SA showed a pulsewidth of 432.47 fs, a bandwidth of 6.16 nm, and a time-bandwidth product (TBP) of 0.323 at fundamental soliton-like operation. This study demonstrates that the atomic-layer structure of graphene from CVD process may provide a reliable graphene based SA for stable soliton-like pulse formation of the MLFL.

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Citations

Jul 20, 2018·Chemical Society Reviews·Victor W BrarDeep Jariwala
Jul 10, 2012·Optics Express·Jia XuPu Wang
Jan 15, 2013·Applied Optics·Dmitry V KhudyakovSergey K Vartapetov
Jun 6, 2013·Optics Express·Grzegorz SobonKrzysztof M Abramski
Jan 22, 2015·Optics Express·Y YangE H T Teo
Oct 1, 2019·Optics Letters·Saifeng ZhangJun Wang
Apr 30, 2021·Nanoscale·Mathieu MassicotteKlaas-Jan Tielrooij

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