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

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 μJ/cm2 and 10% for SWCNT absorber at the direction of alignment, in comparison to 950 μJ/cm2 and 7% for the SWCNT solution.