Blar i NTNU Open på forfatter "Tolstik, Nikolai"
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Raman Soliton Fiber Lasers Tunable Between 1.98 – 2.22 um
Klimentov, Dmitry; Dvoyrin, V. V.; Tolstik, Nikolai; Sorokina, Irina T (Chapter, 2016)We report two compact diode-pumped mode-locked femtosecond thulium-doped silica-fiber-based MOPAs, operating in the Raman soliton regime with the tunability between 1.98-2.22 μm, including a 75-nJ, 21-MHz fiber laser and ... -
Soliton delivery of mid-IR femtosecond pulses with ZBLAN fiber
Tolstik, Nikolai; Sorokin, Evgeni; Kalashnikov, Valdimir L; Sorokina, Irina T (Journal article; Peer reviewed, 2012)We demonstrate environmentally protected delivery of highpower femtosecond mid-IR pulses in a single-mode ZBLAN fiber by soliton formation. A 70-fs Cr:ZnS laser at 2.4 µm reaches this regime already at ~2 nJ launched pulse ... -
Spectral Broadening of mid-IR Femtosecond Pulses in Highly Germanium Doped Fiber
Tolstik, Nikolai; Klimentov, Dmitry; Dvoyrin, Vladislav; Sorokina, Irina T; Sorokin, Evgeni; Kalashnikov, Vladimir (Chapter, 2012)We demonstrate significant spectral broadening of femtosecond mid-IR pulses directly from the oscillator in a simple step-index single-mode highly Ge-doped fiber at only 150 pJ pulse energies in the spectral window around 2.38 µm. -
Spectral-luminescent properties of vapor deposited Cr:ZnS thin films and their application as saturable absorbers for 1.5-μm erbium lasers
Tolstik, Nikolai; Sorokin, Evgeni; Karhu, Eric Andrew; Gorbachenya, Konstantin N.; Polyakov, Stanislav; Kisel, Victor E.; Kuleshov, Nikolai V.; Furtula, Vedran; Gibson, Ursula; Sorokina, Irina T (Journal article; Peer reviewed, 2018)We report the results of the extensive spectral-luminescent characterization including concentration quenching analysis of the first laser-quality vapor-deposited Cr:ZnS films, and demonstrate their use as saturable ... -
Supercontinuum generation in Mid-IR using Chalcogenide and Germanate Nonlinear Fiber
Tolstik, Nikolai; Sorokin, Evgeni; Kalashnikov, Vladimir; Klimentov, Dmitry; Dvoyrin, Vladislav; Sorokina, Irina T (Journal article; Peer reviewed, 2013)We demonstrate mid-infrared (mid-IR) supercontinuum generation with bandwidth from 2 to 2.8 μm at 20 dB below the peak in nonlinear step-index chalcogenide fiber using femtosecond mid-IR pulses directly from the oscillator. ... -
Towards Mid-IR Waveguide Lasers: Transition Metal Doped ZnS Thin Films
Karhu, Eric Andrew; Tolstik, Nikolai; Sorokin, Evgeni; Polyakov, Stanislav; Zamiri, Reza; Furtula, Vedran; Østerberg, Ulf Lennart; Sorokina, Irina T; Gibson, Ursula (Chapter; Peer reviewed, 2016)Thin films of Cr and Fe-doped ZnS suitable for waveguide mid-IR applications, with well-isolated TM2+ peaks, and Cr2+ absorption and fluorescence comparable to bulk crystals were investigated. Raman data indicate that the ... -
Ultrafast fiber-based lasers beyond 2 µm
Sorokina, Irina T; Tolstik, Nikolai; Richter, Roland; Chahal, Radwan; Sorokin, Evgeni (Chapter, 2017)The talk reviews recent advances in fiber based ultrafast mid-IR lasers and frequency combs, outlines the trends in materials as well as novel approaches for generation of ultra-broadband spectra above 2 mm. -
Vapor deposited Cr-doped ZnS thin films: Towards optically pumped mid-infrared waveguide lasers
Karhu, Eric Andrew; Ildstad, Charles Rutherford; Poggio, Stefano; Furtula, Vedran; Tolstik, Nikolai; Sorokina, Irina T; BelBruno, Joseph; Gibson, Ursula (Journal article; Peer reviewed, 2016)Compact, affordable mid-IR lasers require the development of gain materials in waveguide form. We report on the high vacuum deposition of Cr:ZnS films with concentration ranging from 1018-1020 dopants/cm3 . At low ... -
Watt-level Kerr-Lens Mode-Locked Cr:ZnS Laser at 2.4 μm
Tolstik, Nikolai; Sorokin, E; Sorokina, Irina T (Chapter, 2013)Power scaling of Kerr-lens mode-locked Cr:ZnS femtosecond oscillator allows reaching 1 W output power and pulse energies over 8 nJ. Soliton and chirped-pulse regimes result in 68 fs and 0.8-2 ps pulses, respectively.