Ultrafast fiber laser based on gold nanoparticle supported on carbon black saturable absorber

Abstract

Due to their unique physical properties, nonlinear materials are gradually demonstrating significant potential in the field of optics. Gold nanoparticles supported on carbon black (Au/CB), possessing low loss and high nonlinear characteristics, serve as an excellent material for saturable absorber (SA) in ultrafast fiber lasers. In this study, we investigated the performance of Au/CB material and designed an ultrafast fiber laser based on Au/CB SA, successfully observing stable fundamental mode-locking and pulse bunch phenomena. Specifically, when the fiber laser operates in fundamental mode-locking state, the center wavelength of optical spectrum is 1 558.82 nm, with a 3 dB bandwidth of 2.26 nm. Additionally, to investigate the evolution of real-time spectra, the dispersive Fourier transform (DFT) technology is employed. On the other hand, the pulse bunch emitted by the laser is actually composed of numerous random sub-pulses, exhibiting high-energy characteristics. The number of sub-pulses increases with the increase of pump power. These findings contribute to further exploring the properties of Au/CB material and reveal its potential applications in ultrafast optics.

Keywords

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Tianjin University of Technology