• 1 Watt femtosecond mid-IR Cr:ZnS laser 

      Sorokin, Evgeni; Tolstik, Nikolai; Sorokina, Irina T (Journal article; Peer reviewed, 2013)
      A room-temperature Kerr-Lens modelocked (KLM) Cr:ZnS laser generates <70 fs pulses duration (about eight optical cycles) with 5.6 nJ pulse energy and over 100 nm FWHM spectral width at 105-157 MHz repetition rates. The ...
    • 2.4 μm dual-comb spectroscopy 

      Bernhardt, B; Sorokin, Evgeni; Jacquet, P; Thon, R; Becker, T; Sorokina, Irina T; Hansch, TW; Picque, Nathalie (Chapter, 2010)
      A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured ...
    • 8.6 MHz Extended Cavity Cr:ZnS Chirped-pulse Oscillator 

      Tolstik, Nikolai; Lee, Cherrie; Sorokin, Evgeni; Sorokina, Irina T (Chapter, 2018)
      We report the first extended cavity Cr:ZnS chirped-pulse oscillator mode-locked by graphene. We demonstrate 415 mW average power at 8.6 MHz repetition rate which results in 48 nJ pulse energy.
    • Broadly tunable high-power continuous-wave Cr2+:CdS laser 

      Sorokin, Evgeni; Klimentov, Dmitry; Sorokina, Irina T; Kozlovskii, V. I.; Korostelin, Yu. V.; Landman, A. I.; Podmar'kov, Y. P.; Skasyrskii, Ya. K.; Frolov, M. P. (Chapter, 2011)
      We report spectroscopic and laser study of Cr2+:CdS laser - an attractive material for 3 µm room-temperature operation. 1.8 W of output power, continuously tunable over 1000 nm from 2240 nm to 3285 nm was demonstrated.
    • Ceramic Cr:ZnS laser mode-locked by graphene 

      Tolstik, Nikolai; Sorokin, Evgeni; Sorokina, Irina T (Chapter, 2014)
      We report a high-power graphene mode-locked ceramic Cr:ZnS-laser, producing 3.9 nJ, 140 fs pulses with 45 nm spectral bandwidth at 270 MHz repetition rate, at output power for the first time exceeding 1 W level.
    • Chaotic chirped-pulse oscillators 

      Sorokin, Evgeni; Tolstik, Nikolai; Kalashnikov, Vladimir; Sorokina, Irina T (Journal article; Peer reviewed, 2013)
      We present results of experimental investigation of the chaotic and quasi-periodic regime in the chirped-pulsed (dissipative soliton) Cr:ZnS and Cr:ZnSe mid-IR oscillators with significant third-order dispersion. The ...
    • Chirped dissipative soliton absorption spectroscopy 

      Kalashnikov, Vladimir L; Sorokin, Evgeni; Sorokina, Irina T (Journal article; Peer reviewed, 2011)
      We present analytical theory of dissipative soliton absorption spectroscopy. A dissipative soliton formed in an all-normal-dispersion oscillator with a narrowband intracavity absorber acquires spectral features that follow ...
    • Coherent octave-spanning mid-infrared supercontinuum generated in As2S3-silica double-nanospike waveguide pumped by femtosecond Cr:ZnS laser 

      Xie, Shangran; Tolstik, Nikolai; Travers, J.; Sorokin, Evgeni; Caillaud, Celine; Troles, Johann; Russell, Philip St.J.; Sorokina, Irina T (Journal article; Peer reviewed, 2016)
      A more than 1.5 octave-spanning mid-infrared supercontinuum (1.2 to 3.6 μm) is generated by pumping a As2S3-silica “double-nanospike” waveguide via a femtosecond Cr:ZnS laser at 2.35 μm. The combination of the optimized ...
    • Compact Diode-pumped Dispersion-managed SESAM-mode-locked Ho:fiber Laser 

      Tolstik, Nikolai; Sorokin, Evgeni; bugar, ignac; Sorokina, Irina T (Chapter, 2016)
      We demonstrate for the first time a compact mode-locked holmium fiber laser diode-pumped at 1150 nm. The laser was operated in the dispersion-managed dissipative-soliton regime and provided 3.7 nJ pulse energy at 7.8 MHz PRF
    • Continuous-wave broadly tunable high-power Cr:CdS laser 

      Sorokin, Evgeni; Klimentov, Dmitry; Frolov, MP; Korostelin, Yuri; Kozlovsky, VI; Podmar'kov, Yuri; Skasyrsky, Ya K; Sorokina, Irina T (Journal article; Peer reviewed, 2014)
      We report spectroscopic characteristics and laser properties of the mid-infrared active laser medium Cr2+:CdS. Temperature-dependent absorption, luminescence and lifetime measurements of the 5E exited state allow determination ...
    • Continuum generation in Mid-IR from Tm-doped germanate fiber using femtosecond Cr:ZnS laser 

      Tolstik, Nikolai; Klimentov, Dmitry; Dvoyrin, Vladislav; Sorokina, Irina T; Kalashnikov, Vladimir; Sorokin, Evgeni (Chapter, 2012)
      The mid-IR supercontinuum generation in fibers has received much attention due to its broad applicability to high-resolution spectroscopy and trace gas analysis, frequency metrology and optical coherence tomography (OCT). ...
    • Cr4+: YAG chirped-pulse oscillator 

      Sorokin, Evgeni; Kalashnikov, Valdimir L; Mandon, Julien; Guelachvili, Guy; Picque, Nathalie; Sorokina, Irina T (Journal article; Peer reviewed, 2008)
      We demonstrate chirped-pulse operation of a Cr :YAG passively mode-locked laser. Different operation regimes of the laser are extensively investigated in the vicinity of zero dispersion both experimentally and numerically. ...
    • Cr:ZnSe Bulk and Cr:ZnSe Thin Disk cw Lasers 

      Renz, Guenther; Speiser, Jochen; Giesen, Adolf; Sorokina, Irina T; Sorokin, Evgeni (Chapter, 2012)
      A Thulium-fiber-laser pumped Cr:ZnSe bulk cw laser with an output power of 6.5W as well as a Thulium-fiber-laser or diode-laser-stack pumped Cr:ZnSe thin disk cw laser with almost 2W of output powers will be presented.
    • Cr:ZnSe thin disk cw laser 

      Renz, Guenther; Speiser, Jochen; Giesen, Adolf; Sorokina, Irina T; Sorokin, Evgeni (Journal article; Peer reviewed, 2013)
      A Thulium fiber laser pumped or InP diode laser stack pumped Cr:ZnSe thin disk cw multimode laser at 2.4 µm with an output power of 5 and 4 W, respectively, and with optical-tooptical efficiencies of 10% will be presented. ...
    • Diode-pumped mode-locked Holmium fiber laser at 2.138 um 

      Tolstik, Nikolai; Sorokin, Evgeni; bugar, ignac; Sorokina, Irina T (Chapter, 2017)
    • Efficient half-harmonic generation of three-optical-cycle mid-IR frequency comb around 4 µm using OP-GaP 

      Sorokin, Evgeni; Marandi, Alireza; Schunemann, Peter; Fejer, MM; Byer, Robert L.; Sorokina, Irina T (Journal article; Peer reviewed, 2018)
      We report a broadband mid-infrared frequency comb with three-optical-cycle pulse duration centered around 4.2 µm, via half-harmonic generation using orientation-patterned GaP (OP-GaP) with ~43% conversion efficiency. We ...
    • Enhancement and shape control of weak molecular absorption signal with chirped-pulse mid-IR lasers 

      Sorokin, Evgeni; Tolstik, Nikolai; Sorokina, Irina T (Chapter, 2013)
      Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical technology. In this paper we demonstrate nonlinear-optical enhancement and shape control of atmospheric absortion lines using ...
    • Er,Yb:GdAl3(BO3)4 laser passively Q-switched by MBE-grown Cr:ZnS thin films 

      Gorbachenya, Konstantin N.; Kisel, Victor E.; Yasukevich, Anatoly S.; Tolstik, Nikolai; Karhu, Eric Andrew; Furtula, Vedran; Sorokin, Evgeni; Maltsev, VA; leonyuk, N.; Galinis, A.; Lipinskas, T.; Gibson, Ursula; Sorokina, Irina T; Kuleshov, Nikolai V. (Chapter; Peer reviewed, 2017)
    • Femtosecond Cr2+-based lasers 

      Sorokina, Irina T; Sorokin, Evgeni (Journal article; Peer reviewed, 2015)
      We review a novel class of femtosecond Cr2+-doped ZnSe and ZnS lasers, which operates in a very important for applications wavelength range between 2 and 3.5 μm and which generates ultrashort optical pulses that are only ...
    • Femtosecond Cr:ZnS laser at 2.35 µm mode-locked by carbon nanotubes 

      Tolstik, Nikolai; Okhotnikov, Oleg; Sorokin, Evgeni; Sorokina, Irina T (Journal article; Peer reviewed, 2014)
      We report the solid-state Cr:ZnS laser mode-locked by CNT-based saturable absorber. The absorber was deposited on a protected silver mirror used as a high reflector mirror in a standard 250-MHz cavity with chirped mirror ...