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  • 1.
    Davis, Sergio
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Belonoshko, Anatoly
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    van Duin, Adri
    Johansson, Börje
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Molecular dynamics simulation of zirconia melting2010In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, Vol. 8, no 5, p. 789-797Article in journal (Refereed)
    Abstract [en]

    The melting point for the tetragonal and cubic phases of zirconia (ZrO2) was computed using Z-method microcanonical molecular dynamics simulations for two different interaction models: the empirical Lewis-Catlow potential versus the relatively new reactive force field (ReaxFF) model. While both models reproduce the stability of the cubic phase over the tetragonal phase at high temperatures, ReaxFF also gives approximately the correct melting point, around 2900 K, whereas the Lewis-Catlow estimate is above 6000 K.

  • 2.
    Dong, Lin
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Sergeyev, Sergey
    Friberg, Ari T.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Spatial light modulator as a reconfigurable intracavity dispersive element for tunable lasers2010In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, ISSN 1895-1082 print, Vol. 8, no 2, p. 228-234Article in journal (Refereed)
    Abstract [en]

    An improved approach for narrow-band wavelength selection in tunable lasers is described. To provide the tunability, a reconfigurable diffractive optical element (DOE) based on a programmable spatial light modulator (PSLM) is applied. With a proper choice of the phase transfer function of the PSLM, the device can be used as a dispersive intra-cavity component for precise tuning within the lasing spectral band of a solid-state dye laser. The suggested design allows avoiding the mechanical movement of any cavity components. The tunability performance and simulation are demonstrated using the Fourier optics method.

  • 3.
    Lundow, Per Håkan
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Markstrom, Klas
    Reconstruction of the finite size canonical ensemble from incomplete micro-canonical data2009In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, Vol. 7, no 3, p. 490-502Article in journal (Refereed)
    Abstract [en]

    In this paper we discuss how partial knowledge of the density of states for a model can be used to give good approximations of the energy distributions in a given temperature range. From these distributions one can then obtain the statistical moments corresponding to e. g. the internal energy and the specific heat. These questions have gained interest apropos of several recent methods for estimating the density of states of spin models. As a worked example we finally apply these methods to the 3-state Potts model for cubic lattices of linear order up to 128. We give estimates of e. g. latent heat and critical temperature, as well as the micro-canonical properties of interest.

  • 4.
    Popov, Sergei
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Zhang, Rui
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sergeyev, Sergey
    Friberg, Ari T.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Efficiency enhancement in a microcavity solid-state dye laser with Bragg grating reflectors2010In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, ISSN 1895-1082 print, Vol. 8, no 2, p. 202-206Article in journal (Refereed)
    Abstract [en]

    Bragg grating reflectors placed along microcavity facets can improve the efficiency of a polymer dye laser built with such a microcavity. The impact of different reflector designs on the mode pattern and resonance frequencies of the microcavity is numerically simulated and analyzed. This rigorous physical model is based on solving the Maxwell equations and includes such material properties as absorption, dispersion, fluorescence and optical gain. In certain cases, an asymmetrical layout of the reflectors can be more preferable than the pair of reflectors located on opposite sides of the microcavity as it is implemented for typical design.

  • 5. Sergeyev, Sergey
    et al.
    O'Mahoney, Kieran
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Friberg, Ari T.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Upconversion assisted self-pulsing in a high-concentration erbium doped fibre laser2010In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, ISSN 1895-1082 print, Vol. 8, no 2, p. 159-163Article in journal (Refereed)
    Abstract [en]

    We report results on experimental and theoretical characterisation of self-pulsing in high concentration erbium doped fibre laser which is free from erbium clusters. Unlike previous models of self-pulsing accounting for pair-induced quenching (PIQ) on the clustered erbium ions, new model has been developed with accounting for statistical nature of the excitation migration and upconversion and resonance-like pumpto-signal intensity noise transfer. The obtained results are in a good agreement with the experimental data.

  • 6. Sergeyev, Sergey
    et al.
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Friberg, Ari T.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Raman amplification with reduced polarization impairments in the fibre with tailored spin profile2010In: Central European Journal of Physics, ISSN 1895-1082, E-ISSN 1644-3608, ISSN 1895-1082 print, Vol. 8, no 2, p. 164-168Article in journal (Refereed)
    Abstract [en]

    By using two-section fibre where the first section has no spin and the second one is periodically spun, we demonstrate reduced polarization dependent gain and polarization mode dispersion (0.3 dB and 0.0072 ps center dot km(-1/2) correspondently) in a distributed fibre Raman amplifier.

1 - 6 of 6
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