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  1. No Access

    Chapter

    Plasma Perturbations and Cosmic Microwave Background Anisotropy in the Linearly Expanding Milne-Like Universe

    We expose the scenarios of primordial baryon-photon plasma evolution within the framework of the Milne-like universe models. Recently, such models find a second wind and promise an inflation-free solution of a...

    S. L. Cherkas, V. L. Kalashnikov in Fractional Dynamics, Anomalous Transport a… (2018)

  2. No Access

    Article

    An inhomogeneous toy model of the quantum gravity with the explicitly evolvable observables

    An inhomogeneous (1  \(+\)  1)-dimensional model of the quantum gravity is considered. It is found, that this model cor...

    S. L. Cherkas, V. L. Kalashnikov in General Relativity and Gravitation (2012)

  3. No Access

    Article

    Femtosecond pulse enhancement in an external resonator: impact of dispersive and nonlinear effects

    The effect of the high-order dispersions on a femtosecond pulse enhancement in an external resonator is analyzed. It is shown that the degradation of the enhancement factor can be partially compensated by adju...

    V.L. Kalashnikov in Applied Physics B (2008)

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    Article

    Infrared supercontinuum from a large mode area PCF under extreme picosecond excitation

    Evolution of the long-wavelength edge of supercontinuum (SC) in a large mode-area photonic crystal fiber (LMA PCF) under extreme (close to the fiber damage threshold) picosecond excitation is analyzed for the ...

    V. G. Savitski, K. V. Yumashev, V. L. Kalashnikov… in Optical and Quantum Electronics (2007)

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    Article

    Raman effects in the infrared supercontinuum generation in soft-glass PCFs

    Measurements of the Raman gain spectra in the SF6 and SF57 highly nonlinear glasses demonstrated twice as high Raman shift in comparison with the fused silica. Numerical simulation predicted that a large Raman...

    V.L. Kalashnikov, E. Sorokin, I.T. Sorokina in Applied Physics B (2007)

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    Article

    Chirped-pulse oscillators: theory and experiment

    Theory of chirped-pulse oscillators operating in the positive dispersion regime is presented. It is found that the chirped pulses can be described analytically as solitary pulse solutions of the nonlinear cubi...

    V.L. Kalashnikov, E. Podivilov, A. Chernykh, A. Apolonski in Applied Physics B (2006)

  7. No Access

    Article

    Heavily-chirped solitary pulses in the normal dispersion region: New solutions of the cubic-quintic complex Ginzburg-Landau equation

    A new type of the heavily-chirped solitary pulse solutions of the nonlinear cubic-quintic complex Ginzburg-Landau equation has been found. The methodology developed provides for a systematic way to find the ap...

    E. Podivilov, V. L. Kalashnikov in Journal of Experimental and Theoretical Physics Letters (2005)

  8. No Access

    Article

    Low-threshold supercontinuum generation from an extruded SF6 PCF using a compact Cr4+:YAG laser

    The modal properties of an extruded SF6 photonic crystal fiber (PCF) have been analyzed on the basis of a full-vector model. The favorable dispersion properties (the zero-dispersion wavelength for a PCF with 4...

    V.L. Kalashnikov, E. Sorokin, S. Naumov, I.T. Sorokina… in Applied Physics B (2004)

  9. No Access

    Article

    Experiment and modeling of a diode-pumped 1.3 μm Nd:YVO4 laser passively Q-switched with PbS-doped glass

    A diode-pumped 1.34 μm Nd:YVO4 laser passively Q-switched with PbS quantum dots doped glass is presented. An average output power of 24 mW with a Q-switching efficiency of 13% and a Q-switched pulse width of 15 n...

    V.G. Savitski, A.M. Malyarevich, K.V. Yumashev, V.L. Kalashnikov… in Applied Physics B (2004)

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    Article

    Maximization of supercontinua in photonic crystal fibers by using double pulses and polarization effects

    We show with sub-20 fs pulses both experimentally and theoretically two techniques to control the width and polarization of spectral supercontinua generated in photonic crystal fibers. The first exploits doubl...

    V.L. Kalashnikov, P. Dombi, T. Fuji, W.J. Wadsworth, J.C. Knight… in Applied Physics B (2003)

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    Article

    Intra- and extra-cavity spectral broadening and continuum generation at 1.5 μm using compact low-energy femtosecond Cr:YAG laser

    Spectral broadening mechanisms at 1.5 μm in a Kerr-lens mode-locked Cr4+:YAG laser and in a tapered silica fiber have been analyzed. It is shown theoretically and experimentally that both approaches allow generat...

    E. Sorokin, V.L. Kalashnikov, S. Naumov, J. Teipel, F. Warken… in Applied Physics B (2003)

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    Article

    Self-starting five optical cycle pulse generation in Cr4+:YAG laser

    We report stable self-starting near-transform-limited 26-fs pulses at 250-mW output power from a Kerr-lens mode-locked (KLM) Cr4+:YAG laser using chirped mirrors in combination with prisms. The highest output pow...

    S. Naumov, E. Sorokin, V.L. Kalashnikov, G. Tempea, I.T. Sorokina in Applied Physics B (2003)

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    Article

    Pulse energy optimization of passively Q-switched flash-lamp pumped Er:glass laser

    An approach to the energy optimization of the passively Q-switchedEr:glass laser is considered. The optimization procedure is represented in the maximally verifiable and usable graphical form, which is applied...

    V.L. Kalashnikov, V.G. Shcherbitsky, N.V. Kuleshov, S. Girard… in Applied Physics B (2002)

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    Article

    Effect of Stimulated Raman Scattering on Spectral Characteristics of Ultranarrow Pulses in a Mode-Locked Solid-State Laser

    On the basis of numerical modeling, it is shown that the effect of the higher-order group-velocity dispersion is unable to account for the noticeable Stokes displacement of the generation spectrum in a LiSGaF ...

    V. L. Kalashnikov in Journal of Applied Spectroscopy (2000)

  15. No Access

    Article

    Specific features of generation of the quasi-Schrödinger soliton in the CW mode-locked solid-state laser with a semiconductor saturable absorber

    The mechanism of mode-locking in the cw solid-state laser with the saturable semiconductor switch caused by the formation of the quasi-Schrödinger soliton is investigated on the basis of the self-consistent la...

    V. L. Kalashnikov, D. O. Krimer, I. G. Poloiko in Optics and Spectroscopy (2000)

  16. No Access

    Article

    Generation of sub-100-psec pulses by a continuous solid-state laser with a YAG:V3+ crystal-based saturable absorber

    On the basis of the self-consistent laser field theory, the possibility of generation of ultrashort pulses (USP) with duration of the order of tens of picoseconds in a continuous forsterite laser with a YAG:V3+ c...

    V. L. Kalashnikov, D. O. Krimer, F. Mezhid… in Journal of Applied Spectroscopy (2000)

  17. No Access

    Article

    Z-scan measurements of nonlinear refraction and Kerr-lens mode-locking with Yb3+:KY(WO4)2

    The nonlinear refractive index n2 of Yb3+:KY(WO4)2 crystal has been measured using picosecond Z-scan technique. The magnitude of n2 was found to be 8.7 × 10−16 cm2/W at wavelength of 1.08 μm. The numerical modeli...

    K. V. Yumashev, N. N. Posnov, P. V. Prokoshin… in Optical and Quantum Electronics (2000)

  18. No Access

    Article

    Dynamical gain saturation in Kerr-lens mode-locked CW solid- state lasers

    It is shown that dynamical gain saturation, usually neglected for solid-state lasers, can contribute significantly to the pulse-sha** mechanism in Kerr-lens mode-locked lasers. In particular, in combination ...

    V. L. Kalashnikov, I. G. Poloyko, V. P. Mikhailov… in Optical and Quantum Electronics (1999)

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    Article

    Solid-state lasers mode-locked by nonlinear and external linear frequency shift

    A new mechanism of the ultrashort pulse formation in solid-state lasers has been investigated. It was shown that linear frequency shift of the pulse from the centre of the luminescence band along with the self...

    V. L. Kalashnikov, I. G. Poloyko, V. P. Mikhailov in Optical and Quantum Electronics (1997)

  20. No Access

    Chapter

    Solid-State Lasers Mode-Locked by Linear and Nonlinear Frequency Shift

    An effective pulse formation in solid-state lasers is available through the wide variety of resonant and non-resonant optical nonlinearities, e.g. self-phase modulation,1 nonlinear optical Kerr effect2 and self-f...

    V. L. Kalashnikov, V. P. Kalosha, V. P. Mikhailov… in Ultrafast Processes in Spectroscopy (1996)

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