Lili Gui

Observation of various bound solitons in a carbon-nanotube-based erbium fiber laser

Bound solitons with various phase differences and pulse separations were observed in a net-anomalous-dispersion erbium fiber laser mode-locked by carbon nanotubes, including two-soliton bound states with phase differences close to π (out of phase), 0 (in phase), and ±π/2, as well as triple-soliton bound states. To our knowledge, this is the first time that in-phase two-soliton bound states have been obtained experimentally in fiber lasers. Evolution of bound states with change of pump power was investigated, and stability of different bound states was compared. Mechanisms why and how various bound states appeared in the same fiber laser are discussed and analyzed.

Widely Spaced Bound States in a Soliton Fiber Laser With Graphene Saturable Absorber

Highly coherent two-soliton loosely bound states with pulse separation of two orders of magnitude of pulse width are generated by delicate control of initial conditions in a soliton fiber laser using a graphene mode-locker. It represents the most widely spaced bound state directly obtained in fiber lasers as far as overlap of two intracavity solitons is concerned.

Self-Assembled Graphene Membrane as an Ultrafast Mode-Locker in an Erbium Fiber Laser

A self-assembled graphene membrane produced at the liquid/air interface of reduced graphene oxide aqueous suspension is demonstrated as an excellent mode-locker in an erbium-doped soliton fiber laser. Formation of the self-assembled membrane is attributed to hydrophobic nature of graphene and considerable capillary force. Experiments showed that such graphene saturable absorbers with insertion loss less than 6 dB worked well in the laser cavity setup, verifying that the self-assembly method is reliable and practical. Moreover, the method is quite facile, cost-effective, and potentially suitable for large-scale production of graphene mode-lockers.

Generation of 35-nJ Nanosecond Pulse From a Passively Mode-Locked Tm, Ho-Codoped Fiber Laser With Graphene Saturable Absorber

We report a passively mode-locked thulium, holmium-codoped fiber laser with graphene saturable absorber. Stable nanosecond pulse with output pulse energy up to 35 nJ is obtained at the repetition rate of 0.964 MHz. The tunable output spectral range is from 1897.69 to 1930.27 nm by simply changing the pump power. Higher output pulse energy is promising but limited by the damage threshold of the fiber component.

Generation of 32 nd harmonic in passively mode-locked erbium-doped laser with graphene saturable absorber

We report passive mode locking of a soliton erbium-doped fiber laser based on graphene saturable absorber at repetition rate continuously scalable up to 500 MHz. The supermodes are suppressed by 50 dB at 32nd harmonic.

Mode-locked operation of an erbium-doped fiber laser using a self-assembled graphene membrane after excitation of Q-switched pulse

Graphene is considered to be an excellent fast saturable absorber (SA) with a broad operation bandwidth due to its ultrafast carrier dynamics and linear energy-momentum relation near the Dirac point [1]. Since Bao, Zhang, et al. employed it to successfully mode-lock a fiber laser for the first time [2], extensive efforts [3] have been devoted to developing this popular field, i.e., graphene-based ultrafast photonics.

Observation of various bound solitons of a fiber laser with carbon nanotubes and graphene as saturable absorbers

Both in-phase and anti-phase two-soliton bound states were observed in a carbon-nanotube based mode-locked fiber laser. This paper also reports preliminary results of bound states with graphene as the saturable absorber for the first time.