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

Pi Ling Huang, Shau Ching Lin, Chao Yung Yeh, Hsin Hui Kuo, Shr Hau Huang, Gong Ru Lin, Lain Jong Li, Ching Yuan Su, Wood Hi Cheng

Research output: Contribution to journalArticlepeer-review

159 Scopus citations

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 multilayer 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 solitonlike 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.

Original languageEnglish
Pages (from-to)2460-2465
Number of pages6
JournalOptics Express
Volume20
Issue number3
DOIs
StatePublished - 30 Jan 2012

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