Third harmonic generation in graphene and few-layer graphite films

@article{Kumar2013ThirdHG,
  title={Third harmonic generation in graphene and few-layer graphite films},
  author={Nardeep Kumar and Jatinder Kumar and Christian Gerstenkorn and Rui Wang and Hsin-Ying Chiu and Arthur L. Smirl and Hui Zhao},
  journal={Physical Review B},
  year={2013},
  volume={87},
  pages={121406}
}
We observe optical third harmonic generation from graphene and few-layer graphite flakes produced by exfoliation. The emission scales with the cube of the intensity of the incident near-infrared femtosecond pulses and has a wavelength that is one-third of the incident wavelength, both consistent with third harmonic generation. We extract an effective third-order susceptibility for graphene that is on the order of 1e-16 square meter per square volt, which is comparable to that for materials that… 

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