Pulse dynamics in carbon nanotube mode-locked fiber lasers near zero cavity dispersion

Abstract

We numerically and experimentally analyze the output characteristics and pulse dynamics of carbon nanotube mode-locked fiber lasers near zero cavity dispersion (from 0.02 to ~-0.02 ps(2)). We focus on such near zero dispersion cavities to reveal the dispersion related transition between different mode-locking regimes (such as soliton-like, stretched-pulse and self-similar regimes). Using our proposed model, we develop a nanotube-mode-locked fiber laser setup generating ~97 fs pulse which operates in the stretched-pulse regime. The corresponding experimental results and pulse dynamics are in good agreement with the numerical results. Also, the experimental results from soliton-like and self-similar regimes exhibit the same trends with simulations. Our study will aid design of different mode-locking regimes based on other new saturable absorber materials to achieve ultra-short pulse duration.

Generation of dark solitons in erbium-doped fiber lasers based Sb_2Te_3 saturable absorbers

“…The mode-locked EDF laser based Sb 2 Te 3 SA can be modeled by the nonlinear Schrödinger (NLS) equation as follows [36],…”

Dynamics of a Dispersion-Managed Passively Mode-Locked Er-Doped Fiber Laser Using Single Wall Carbon Nanotubes

“…So far, the dynamics of general ultrashort pulse fiber lasers has been reported by a few groups [18][19][20]. Recently, the analysis of SWNT fiber laser near zero cavity dispersion was reported by J. Wang et al in terms of the pulse width [21].…”

Tungsten disulfide saturable absorbers for 67 fs mode-locked erbium-doped fiber lasers

“…However, compared to other mode locking mechanism, the relatively high pump power has been needed for the mode-locked operation. Besides, they have been influenced by environment conditions easily, and usually have the relatively high modelocking threshold [7][8][9][10][11][12][13][14][15][16][17][18][19]. SAs, such as semiconductor saturable absorber mirrors (SESAMs) and 2D material SAs, can be used to overcome those disadvantages.…”

“…SESAMs are relatively flexible for the design of the laser cavity, but the fabrication process of SESAMs is complicated, the price is expensive, the damage threshold is low, and the bandwidth is narrow [7,8]. With the development of the material technology, 2D materials as broadband saturable absorption materials have been applied to the SAs preparation successfully, and 2D material SAs in fiber lasers have shown excellent performance [9][10][11][12][13][14][15][16][17][18][19].…”