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Author: Babushkin, Ihar × End date: 2019 × Start date: 2019 × End date: 2009 × Start date: 2009 ×

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    Scar-like structures and their localization in a perfectly square optical billiard
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2009) Babushkin, Ihar
    We show that scar-like structures (SLS) in a wide aperture vertical cavity surface emitting laser (VCSEL) can be formed even in a perfectly square geometry due to interaction of polarization and spatial degrees of freedom of light. We show also that dissipation in the system induces an order among the cavity modes, so that SLS become preferred at lasing threshold. More generally, modes which are more localized both in coordinate and momentum space have in average lower losses.
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    Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2009) Schulz-Ruhtenberg, Malte; Babushkin, Ihar; Loiko, Natalia Aleksandrovna; Huang, K.F.; Ackemann, T.
    For highly divergent emission of broad-area vertical-cavity surface-emitting lasers (VCSELs) a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth one, where it is significantly nonzero during the transition.
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    Non-Poissonian statistics in an optical analog of quantum billiard with perfectly square boundaries
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2009) Babushkin, Ihar
    We study deviation from the Poissonian statistics of the frequency spacing distribution, appearing due to coupling of polarizational and transverse degrees of freedom in a perfectly square vertical cavity surface emitting laser. The deviation can be controlled by strength of the intracavity anisotropy and its alignment to the device boundaries.