We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser (EDFL) using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film. The laser allows generation of the pulses with a repetition rate of 580 MHz, which corresponds to the 22nd harmonics of a 26.3 MHz fundamental repetition rate under 323 mW pump power. A particularly noteworthy feature of the pulses is the super-mode suppression ratio (SMSR), which is over 40 dB, indicating a stable operation.
Bibliographical note© 2018 Chinese Laser Press.
Funding: This work was supported by the National Natural Science Foundation of China (NSFC) (No. 61605107), the Young Eastern Scholar Program at Shanghai Institutions of Higher Learning (No. QD2015027), and the “Young 1000 Talent Plan” Program of China. The authors also acknowledge support from the Ministry of Higher Education, Sultanate of Oman; Marie Sklodowask-Curie IEF project (H2020-MSCA-IF-2014_ST, Proposal #:656984); Marie-Curie International Research Staff Exchange Scheme “TelaSens” project, Research Executive Agency (Grant No. 269271, Programme: FP7-PEOPLE-2010-IRSES).