Saturable absorber at 940 nm using single wall carbon nanotubes deposited by vertical evaporation technique

Abstract

The vertical evaporation technique allows us to fabricate aligned single wall carbon saturable absorbers. The nonlinear parameters of the absorber at the wavelength of 940 nm were measured. The measured bi-exponential lifetimes of the absorber are 330 fs and 850 fs, respectively. The saturation intensity and modulation depth were found to be 2000 mu J/cm(2) and 10% for SWCNT absorber at the direction of alignment, in comparison to 950 mu J/cm(2) and 7% for the SWCNT solution. Crown Copyright (C) 2011 Published by Elsevier GmbH. All rights reserved.