title: Suppression of continuous lasing in a carbon nanotube polyimide film mode-locked erbium-doped fiber laser.
abstract: We demonstrated an erbium-doped mode-locked fiber laser using a single-walled carbon nanotube-dispersed polyimide (SWNT-PI) film. Different mode-locking operations were compared and analyzed utilizing SWNT-PI films with different concentrations (2, 1, and 0.25 wt.%, respectively). It was found that the continuous single-pulse mode-locking operation was often accompanied by a continuous wave oscillation part for the 1 and 0.25 wt.% SWNT-PI films, whereas the 2 wt.% SWNT-PI film presented the most excellent mode-locking performance, thanks to sufficient modulation depth. Using the 2 wt.% SWNT-PI film, a stable pulse train with a pulse width of 840 fs and a repetition rate of 15.3 MHz was achieved. The average output power was 0.33 mW at the pump power of 155 mW under an output coupling ratio of 10%. Operational performance of the laser cavity when employing the 2 wt.% SWNT-PI film was also demonstrated.
authors.affiliation: State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Gui
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Guangzhen
authors.initials: G
authors.lastname: Zhao
authors.forename: Xu
authors.initials: X
authors.lastname: Yang
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Xiao
authors.forename: Jinsong
authors.initials: J
authors.lastname: Zhu
authors.forename: Changxi
authors.initials: C
authors.lastname: Yang
mesh_terms: D004867:Equipment Design; D004871:Erbium / Q000737:chemistry; D005336:Fiber Optic Technology / Q000295:instrumentation; D053844:Lasers, Solid-State; D008027:Light; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D012117:Resins, Synthetic; C029945:polyimide resin; D004871:Erbium