Browsing NTNU Open by Author "Sorokina, Irina T"

Now showing items 61-80 of 85

    • Multi-Kilowatt Peak Power Nanosecond Er-Doped Fiber Laser 

      Dvoyrin, Vladislav; Klimentov, Dmitry; Klepsvik, JO; Mazaeva, IV; Sorokina, Irina T (Journal article, 2016)
      We report a two-stage diode-pumped Er-doped fiber amplifier operating at the wavelength of 1550 nm at the repetition rate of 10-100 kHz with an average output power of up to 10 W. The first stage comprising Er-doped fiber ...

    • Nonlinear Propagation of mid-IR Femtosecond Pulses in ZBLAN Fiber 

      Tolstik, Nikolai; Sorokin, Evgeni; Kalashnikov, Vladimir; Sorokina, Irina T (Chapter, 2012)
      We demonstrate environmentally protected delivery of high-power 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 ~1.5 nJ launched ...

    • Novel Short-pulsed Holmium-fiber Master Oscillator Power Amplifier for LiDAR applications 

      Bakke, Ingrid Katrina (Master thesis, 2018)

    • Novel Y2O3-codoped Yb/Tm-doped picosecond fiber laser 

      Dvoyrin, Vladislav; Klimentov, Dmitry; Halder, Arindam; Mukul C, Paul; Mrinmay, Pal; Bhadra, Shyamal K; Kir'yanov, Alexander; Sorokina, Irina T (Journal article; Peer reviewed, 2013)
      We demonstrate the novel picosecond mode-locked Y2O3-codoped Yb/Tm-doped fiber lasers, operating at 1950 nm and producing pulses of up to 1 nJ energy, using a SESAM and an Er-doped pump fiber laser operating at the wavelength ...

    • 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 ...

    • Principles, advances and applications of ultrafast mid-infrared lasers 

      Sorokina, Irina T; Sorokin, Evgeni (Chapter, 2009)
      The talk reviews principles and advances in generation and applications of ultrashort pulses and frequency combs directly from the solid-state oscillator based on Cr2+ZnSe laser, and highlights radical efficiency and ...

    • 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 ...

    • Sensitive multiplex spectroscopy in molecular fingerprint 2.4 um region with a Cr2+:ZnSe femtosecond laser 

      Sorokin, E; Sorokina, Irina T; Mandon, J; Guelachvili, G; Picque, N. (Journal article; Peer reviewed, 2007)
      An ultrashort-pulse Cr2+:ZnSe laser is a novel broadband source for sensitive high resolution molecular spectroscopy. A 130-fs pulse allows covering of up to 380 cm-1 spectral domain around 2.4 µm which is analyzed ...

    • Soliton absorption spectroscopy in normal-dispersion lasers 

      Kalashnikov, Vladimir; Sorokin, Evgeni; Sorokina, Irina T (Chapter, 2010)
      An all-normal-dispersion oscillator with narrowband intracavity absorption acquires spectral features which follow the index of refraction of the absorber, as confirmed by experimental obsevation. Compared to the conventional ...

    • 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 ...

    • Spatial-temporal structure of the femtosecond third harmonic generation in photonic-crystal fibers 

      Kalashnikov, VL; Sorokin, E; Sorokina, Irina T (Journal article; Peer reviewed, 2007)
      We analyze the third harmonic generation by the supercontinuum at 1.5 µm in nonlinear-glass microstructured fibers. The numerical model includes the real field dynamics and allows analyzing the spectral as well as the ...

    • 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. ...

    • Three-optical-cycle frequency comb centered around 4.2 µm using OP-GaP-based half-harmonic generation 

      Sorokin, Evgeni; Marandi, Alireza; Schunemann, PG; Fejer, M; Sorokina, Irina T; Byer, Robert L. (Chapter, 2016)
      We report a broadband mid-infrared frequency comb with three-optical-cycle pulse duration centered around 4.2 µm, with up to 220 mW average power, via OP-GaP-based half-harmonic generation pumped by mode-locked fiber lasers.

    • Tm3+-doped CW fiber laser based on a highly GeO2-doped dispersion-shifted fiber 

      Dvoyrin, Vladislav; Sorokina, Irina T; Mashinsky, Valery M.; Ischakova, Lyudmila D.; Dianov, Evgenii M; Kalashnikov, Valdimir L; Yashkov, Mikhail V.; Khopin, Vladimir F.; Guryanov, Aleksey N. (Journal article; Peer reviewed, 2011)
      A novel all-fiber laser based on a highly GeO2-doped dispersion-shifted Tm-codoped fiber, pumped at 1.56 µm wavelength and lasing at 1.862 µm wavelength with a slope efficiency up to 37% was demonstrated. The single-mode ...

    • Towards a New Ceramic-Glass Fiber Femtosecond Laser in the 2-3 Micrometer Wavelength Range - Cr2+ Doped Ceramic Glass Fibers and Graphene Saturable Absorber Mirrors 

      Augdal, Marte Bondø (Master thesis, 2017)
      Solid-state lasers, and in particular fiber lasers, are becoming the most commonly used lasers in science and industry, next only to diode lasers. This work has targeted the development of two novel types of laser active ...

    • 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 ...

    • Ultrabroad Continuous-Wave Tuning of Ceramic Cr:ZnSe and Cr:ZnS Lasers 

      Sorokin, Evgeni; Sorokina, Irina T; Mirov, M.; Fedorov, V.; Moskalev, I.; Mirov, S. (Chapter, 2010)
      Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth.

    • 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.