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  • 1
    Online Resource
    Online Resource
    Transient radiation from a circular string of dipoles excited at superluminal velocity (2014)
    Berlin
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: This paper discusses the features of transient radiation from periodic one-dimensional resonant medium excited by ultrashort pulse. The case of circular geometry is considered for the harmonic distribution of the density of the particles along the circle. It is shown that a new frequency component arises in the spectrum of the scattered radiation in addition to the resonance frequency of medium. The new frequency appears both in the case of linear and nonlinear interaction, its value depends on the velocity of excitation pulse propagation and on the period of spatial modulation. In addition, the case when excitation moves at superluminal velocity and Cherenkov radiation arises is also studied.
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 17 S., 518 KB) , Ill., graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 2034
    URL: https://edocs.tib.eu/files/e01fn15/813658985.pdf
    Language: English
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  • 2
    Online Resource
    Online Resource
    Coherent passive mode-locking in lasers: Qualitative analysis and numerical simulations (2014)
    Berlin : Weierstraß-Inst. für Angewandte Analysis und Stochastik Leibniz-Inst. im Forschungsverbund Berlin e.V.
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: In the present work we report the possibility of passive mode-locking based on the coherent interaction of light with the amplifying and absorbing media in lasers with ring and linear cavities. We consider the realistic and practically interesting case when the absorbing and amplifying media are separated in the cavity space but not homogeneously mixed in the volume of the cavity, as was considered earlier in the literature. We perform qualitative consideration of coherent passive mode-locking based on the area theorem of McCall and Hahn and its graphical representation for the first time. We show that other, not soliton scenarios of passive mode-locking exist, and that coherent mode-locking is self-starting (lasing without an injection seeding pulse is possible). We point to the fact that the spectral width of the laser generation can be significantly larger than the spectral bandwidth of the gain medium. Numerical simulations were performed using the system of Maxwell-Bloch equations in the slowly varying envelope approximation.
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 37 S., 4.494 KB) , graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 2019
    URL: https://edocs.tib.eu/files/e01fn15/81333490X.pdf
    Language: English
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  • 3
    Online Resource
    Online Resource
    Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers (2009)
    Berlin
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: 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.
    Type of Medium: Online Resource
    Pages: Online-Ressource (24 S., 849 KB) , Ill., graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 1445
    URL: http://webdoc.sub.gwdg.de/ebook/serien/e/wias/2009/wias_preprints_1445.pdf
    URL: https://edocs.tib.eu/files/e01fn11/610154524.pdf
    DDC: 510
    Language: English
    Note: Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 4
    Online Resource
    Online Resource
    Regularizing aperiodic cycles of resonant radiation in filament light bullets (2017)
    Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik Leibniz-Institut im Forschungsverbund Berlin e.V.
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: We demonstrate an up to now unrecognized and very effective mechanism which prevents filament collapse and allows persistent self-guiding propagation retaining larg portion of the optical energy on-axis over unexpected long distances. The key ingredient is the possibility of leaking continuously energy into the normal dispersion regime via emission of resonant radiation. The frequency of the radiation is determined by the dispersion dynamically modified by photo-generated plasma, thus allowing to excite new frequencies in the spectral ranges which are otherwise difficult to access.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (11 Seiten, 3.878 kB) , Illustrationen, Diagramme
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik no. 2394
    URL: https://doi.org/10.20347/WIAS.PREPRINT.2394
    DOI: 10.20347/WIAS.PREPRINT.2394
    Language: English
    Note: Literaturverzeichnis: Seite 7-9
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  • 5
    Online Resource
    Online Resource
    Transient pulse compression at a group velocity horizon (2015)
    Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik im Forschungsverbund Berlin e.V.
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: Group-velocity matched cross-phase modulation between a fundamental soliton and a dispersive wave-packet has been previously suggested for optical switching applications similar to an optical transistor. Moreover, the nonlinear interaction in the resulting groupvelocity horizon can be exploited for adiabatic compression of the soliton down into the fewcycle regime. Here we show that both mechanisms can be combined. In such a transient compressor, parameters of the dispersive wave may then serve to actively control the soliton compression and adjust the pulse duration in the presence of disturbances. While a certain amount of control is already enabled by the delay between soliton and dispersive wave, the means of controlling the compression process are substantially enhanced by additionally manipulating the chirp of the dispersive wave. Moreover, controlling the chirp of the dispersive wave also enables correction for limitations of the compression scheme due to a self-frequency shift of the soliton or for uncompensated dispersion in the scheme. This substantially widens the practicality of the compression scheme and other applications of the highly efficient nonlinear interaction at the group-velocity horizon.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (16 Seiten, 22,0 MB) , Diagramme
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik No. 2120
    URL: https://edocs.tib.eu/files/e01fn16/868725226.pdf
    Language: English
    Note: Literaturverzeichnis: Seite 13-14
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  • 6
    Online Resource
    Online Resource
    The fundamental solution of unidirectional pulse propagation equation (2013)
    Berlin : WIAS, Weierstraß-Institut für Angewandte Analysis und Stochastik
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 13 S., 999 KB) , graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 1808
    URL: https://edocs.tib.eu/files/e01fn13/774646217.pdf
    URL: http://webdoc.sub.gwdg.de/ebook/serien/e/wias/2014/wias_preprints_1808.pdf
    Language: English
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  • 7
    Online Resource
    Online Resource
    Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides (2010)
    Berlin : WIAS
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: The generation of THz radiation from ionizing two-color femtosecond pulses propagating in metallic hollow waveguides filled with Ar is numerically studied. We observe a strong reshaping of the low-frequency part of the spectrum. Namely, after several millimeters of propagation the spectrum is extended from hundreds of GHz up to $sim 150$ THz. For longer propagation distances, nearly single-cycle near-infrared pulses with wavelengths around 4.5 $mu$m are obtained by appropriate spectral filtering, with an efficiency of up to 0.25 %.
    Type of Medium: Online Resource
    Pages: Online-Ressource (10 S., 604 KB) , graph. Darst
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik im Forschungsverbund Berlin e.V. 1483
    URL: http://webdoc.sub.gwdg.de/ebook/serien/e/wias/2012/wias_preprints_1483.pdf
    URL: https://edocs.tib.eu/files/e01fn11/664534287.pdf
    RVK:
    SI 304
    Language: English
    Note: Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 8
    Online Resource
    Online Resource
    Self-starting stable coherent mode-locking in a two-section laser (2014)
    Berlin : Weierstraß-Inst. für Angewandte Analysis und Stochastik Leibniz-Inst. im Forschungsverbund Berlin e.V.
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: In the present work we report the possibility of passive mode-locking based on the coherent interaction of light with the amplifying and absorbing media in lasers with ring and linear cavities. We consider the realistic and practically interesting case when the absorbing and amplifying media are separated in the cavity space but not homogeneously mixed in the volume of the cavity, as was considered earlier in the literature. We perform qualitative consideration of coherent passive mode-locking based on the area theorem of McCall and Hahn and its graphical representation for the first time. We show that other, not soliton scenarios of passive mode-locking exist, and that coherent mode-locking is self-starting (lasing without an injection seeding pulse is possible). We point to the fact that the spectral width of the laser generation can be significantly larger than the spectral bandwidth of the gain medium. Numerical simulations were performed using the system of Maxwell-Bloch equations in the slowly varying envelope approximation.
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 11 S., 206 KB) , graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 2030
    URL: https://edocs.tib.eu/files/e01fn15/821166964.pdf
    Language: English
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  • 9
    Online Resource
    Online Resource
    Scar-like structures and their localization in a perfectly square optical billiard (2009)
    Berlin : WIAS
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: 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.
    Type of Medium: Online Resource
    Pages: Online-Ressource (10 S., 173 KB) , Ill., graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 1465
    URL: http://webdoc.sub.gwdg.de/ebook/serien/e/wias/2011/wias_preprints_1465.pdf
    URL: https://edocs.tib.eu/files/e01fn11/664501184.pdf
    Language: English
    Note: Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 10
    Online Resource
    Online Resource
    Non-Poissonian statistics in an optical analog of quantum billiard with perfectly square boundaries (2009)
    Berlin : WIAS
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: 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.
    Type of Medium: Online Resource
    Pages: Online-Ressource (12 S., 180 KB) , Ill., graph. Darst.
    Series Statement: Preprint / Weierstraß-Institut für Angewandte Analysis und Stochastik 1468
    URL: http://webdoc.sub.gwdg.de/ebook/serien/e/wias/2011/wias_preprints_1468.pdf
    URL: https://edocs.tib.eu/files/e01fn11/664502237.pdf
    Language: English
    Note: Literaturangaben , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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