Browsing NTNU Open by Author "Sorokin, E."

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    • Chaotic regime in chirped-pulse mid-IR oscillators 

      Sorokin, E.; Tolstik, Nikolai; Kalashnikov, Valdimir L; Sorokina, Irina T (Chapter, 2013)
      We present experimental investigation of the chaotic mode-locking operation regime in two novel chirped-pulsed Cr:ZnS and Cr:ZnSe mid-IR lasers. The long-term stable regime is caused by the nonlinear interaction of dispersive ...

    • Graphene mode-locked Cr:ZnS laser with 44 fs pulse duration 

      Tolstik, Nikolai; Pospischil, Andreas; Sorokin, E.; Sorokina, Irina T (Chapter, 2013)
      The first Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror generates the shortest reported so far mid-IR pulses of only 5.5 optical cycles (44 fs) at 2.35 μm with 139 nm spectral bandwidth.

    • Graphene-mode-locked Holmium Fiber Laser Operating Beyond 2.1 µm 

      Dvoyrin, Vladislav; Tolstik, Nikolai; Sorokin, E.; Sorokina, Irina T; Kurkov, A. (Chapter, 2015)

    • Mid-Infrared Femtosecond Laser 

      Sorokin, E.; Tolstik, Nikolai; Sorokina, Irina T (Chapter, 2013)
      Recent breakthroughs in femtosecond lasers operating directly in the mid-infrared wavelength region enabled generation of Watt-level output with ~10-nJ pulses and only 5 optical cycles duration, demonstrating interesting ...

    • Octave-spanning Supercontinuum From As2S3-silica Double-nanospike Waveguide Pumped by Femtosecond Cr:ZnS Laser at 2.35 μm 

      Tolstik, Nikolai; Xie, Shangran; Sorokin, E.; Travers, J.; Troles, J.; Russell, Philip; Sorokina, Irina T (Chapter, 2015)
      We generate a 1.2 to 3.6 μm supercontinuum using a As2S3-silica double-nanospike waveguide pumped by femtosecond Cr:ZnS laser. Varying the core diameter allows the group velocity dispersion to be fine-tuned, thus maximizing ...