We analyze the phase shift induced in an amplitude-modulated laser beam propagating through a water dispersion of graphene oxide sheets in a fiber-to-fiber U-bench. This phase shift arises from the thermally induced nonlinear refraction in the sample. The system exhibits strong optical limiting performance for weak continuous-wave signals. A theoretical model including beam propagation and thermal lens focal length oscillation reproduces the experimental findings.
© 2014 Optical Society of America
Original Manuscript: January 2, 2014
Manuscript Accepted: February 1, 2014
Published: April 8, 2014
Sonia Melle, Oscar G. Calderón, Ana Egatz-Gómez, E. Cabrera-Granado, F. Carreño, M. A. Antón, and H. J. Salavagione, "Phase shift of amplitude-modulated optical signals in graphene oxide water dispersions due to thermal lens focal length oscillation," J. Opt. Soc. Am. B 31, 1018-1025 (2014)