We demonstrate a passively mode-locked and a passively Q-switched erbium-doped fiber laser respectively by utilizing a same saturable absorber fabricated with tungsten trioxide (WO3). When the WO3 saturable absorber is employed to provide the pulse narrowing effect, Q-switched pulses were observed with a repetition rate of 44.11 kHz and a pulse width of 3.42 μs. Moreover, the Q-switched laser could realize hybrid mode-locking after an in-line polarizer was inserted, which could introduce an additional pulse narrowing effect of nonlinear polarization rotation under a certain polarization state. The 3- dB spectral bandwidth and the repetition rate of mode-locked pulses are about 7.5 nm and 22.51 MHz respectively. The pulse train is stable with a signal to noise ratio of 70 dB.
A hybrid mode-locked Er-doped fiber laser based on single-walled carbon nanotube saturable absorber and nonlinear amplifying loop mirror (NALM) is constructed. At 1564.5 nm, the mode-locked laser is self-started by carefully adjusting the polarization controller, with the repetition frequency of 16.24 MHz, 3-dB spectral width of 8.5 nm and pulse width of 302 fs. Compared with the laser only utilizing single-wall carbon nanotube saturable absorber or NALM mode-locked Er-doped fiber laser, the hybrid one has narrower output pulse width and the mode-locking state is more stable.
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