Optics Communications ( IF 2.125 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.optcom.2020.125315 Xiaodong Zhang, Hongwei Chu, Ying Li, Yan Zhang, Shengzhi Zhao, Dechun Li
The single-wall carbon nanotubes (SWCNTs) with the specific chirality (6, 5) and (7, 5) were sorted out by the density gradient ultracentrifugation (DGU) method. 2D photoluminescence excitation–emission map and the Raman spectrum confirmed the successful chirality-selection. The nonlinear optical performance of the chirality-selected SWCNTs was investigated by an open-aperture Z-scan setup. By employing the prepared SWCNTs saturable absorber (SWCNTs-SA), the minimum pulse duration of 115 ns with a pulse repetition rate of 550 kHz was obtained in the passively Q-switched (PQS) laser operation.