Graphene mode-locked ultrafast laser.

Sun, Z and Hasan, T and Torrisi, F and Popa, D and Privitera, G and Wang, F and Bonaccorso, F and Basko, DM and Ferrari, AC (2010) Graphene mode-locked ultrafast laser. ACS Nano, 4. pp. 803-810.

Abstract

Graphene is at the center of a significant research effort. Near-ballistic transport at room temperature and high mobility make it a potential material for nanoelectronics. Its electronic and mechanical properties are also ideal for micro- and nanomechanical systems, thin-film transistors, and transparent and conductive composites and electrodes. Here we exploit the optoelectronic properties of graphene to realize an ultrafast laser. A graphene-polymer composite is fabricated using wet-chemistry techniques. Pauli blocking following intense illumination results in saturable absorption, independent of wavelength. This is used to passively mode-lock an erbium-doped fiber laser working at 1559 nm, with a 5.24 nm spectral bandwidth and approximately 460 fs pulse duration, paving the way to graphene-based photonics.