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.
Highlights
Mode-locked ultrafast pulses, in particular, with
Mode-locked fiber lasers normally have large nonlinear effects and high-order dispersion which limit the accessible pulse duration to several hundred femtoseconds, appropriate interplay between dispersion, nonlinearity, saturable absorber (SA) and gain medium still provides the possibility of generating sub-100 fs pulses [5,6,7]
We present our study and analysis of pulse dynamics of Single-wall carbon nanotubes (SWNTs)-SA mode-locked fiber lasers near zero cavity group velocity dispersion (GVD) using a numerical model based on nonlinear Schrödinger Equation (NLSE)
Summary
Mode-locked ultrafast pulses, in particular, with
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