Stable passive mode-locked fiber lasers(MLFLs) employing graphene saturable absorber (SA) are demonstrated. The graphene were dispersed in de-ionized water by two different dispersants including fluorinated mica clay (Mica) and poly(oxyethylene)-segmented imide (POEM). Using the SA made by graphene dispersed in Mica with thickness and concentration product (TCP) of 36 (£gm*wt%), the MLFLs exhibited pulsewidth, 3-dB spectral bandwidth, and modulation depth (MD) of 382 fs, 6.80 nm, and 2.57%, respectively. The graphene dispersed in POEM provides a TCP of 38 (£gm*wt%) to make the MLFLs deliver pulsewidth, 3-dB spectral bandwidth, and MD of 422 fs, 6.35 nm, and 1.70%, respectively. In comparison, the graphene SA dispersed by Mica performs a better MLFL pulse quality than that dispersed by POEM. Lastly, for investigating the dispersed uniformity between Mica and POEM, we randomly chose 9 pieces and measured the MLFL performance. The result showed that using the SA made by graphene dispersed in Mica with TCP of 36 (£gm*wt%), the MLFLs exhibited pulsewidth of 393¡Ó14 fs, By contrast, the graphene dispersed in POEM provided a TCP of 38 (£gm*wt%) to make the MLFLs delivered pulsewidth of 442¡Ó32 fs. This result reveals that graphene SA film dispersed by Mica exhibited better uniformity than POEM.
The MLFL of 21-layes CVD process graphene SA showed a pulsewidth of 432.47 fs, a bandwidth of 6.16nm, and a time-bandwidth product (TBP) of 0.323. This result showed that the solution blending process graphene SA exhibited better MLFL performance than CVD.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0904112-064653 |
| Date | 04 September 2012 |
| Creators | Huang, Shr-Hau |
| Contributors | Jiang-Jen Lin, Wood-Hi Cheng, Gong-Ru Lin, Chao-Yung Yeh, Hsin-Hui Kuo, Pi-Ling Huang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0904112-064653 |
| Rights | user_define, Copyright information available at source archive |
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