Graphene mode-locked Cr:ZnS laser with 41 fs pulse duration.

@article{Tolstik2014GrapheneMC,
  title={Graphene mode-locked Cr:ZnS laser with 41 fs pulse duration.},
  author={Nikolai A Tolstik and Evgeni Sorokin and Irina T. Sorokina},
  journal={Optics express},
  year={2014},
  volume={22 5},
  pages={5564-71}
}
We report the ultrashort-pulse Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror. Using the combination of bulk material and a chirped mirror, we demonstrate the shortest reported so far mid-IR pulses of only 5.1 optical cycles (41 fs) centered at 2.4 µm with 190 nm spectral bandwidth. The pulse spectrum almost completely fills the water-free atmospheric window. The output parameters reach 2.3 nJ pulse energy and 250 mW average output power at 108 MHz repetition rate. 
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