Search Results - (Author, Cooperation:U. Menzel)

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  1. 1
    J. Aleksic ; S. Ansoldi ; L. A. Antonelli ; P. Antoranz ; A. Babic ; P. Bangale ; J. A. Barrio ; J. Becerra Gonzalez ; W. Bednarek ; E. Bernardini ; B. Biasuzzi ; A. Biland ; O. Blanch ; S. Bonnefoy ; G. Bonnoli ; F. Borracci ; T. Bretz ; E. Carmona ; A. Carosi ; P. Colin ; E. Colombo ; J. L. Contreras ; J. Cortina ; S. Covino ; P. Da Vela ; F. Dazzi ; A. De Angelis ; G. De Caneva ; B. De Lotto ; E. de Ona Wilhelmi ; C. Delgado Mendez ; D. Dominis Prester ; D. Dorner ; M. Doro ; S. Einecke ; D. Eisenacher ; D. Elsaesser ; M. V. Fonseca ; L. Font ; K. Frantzen ; C. Fruck ; D. Galindo ; R. J. Garcia Lopez ; M. Garczarczyk ; D. Garrido Terrats ; M. Gaug ; N. Godinovic ; A. Gonzalez Munoz ; S. R. Gozzini ; D. Hadasch ; Y. Hanabata ; M. Hayashida ; J. Herrera ; D. Hildebrand ; J. Hose ; D. Hrupec ; W. Idec ; V. Kadenius ; H. Kellermann ; K. Kodani ; Y. Konno ; J. Krause ; H. Kubo ; J. Kushida ; A. La Barbera ; D. Lelas ; N. Lewandowska ; E. Lindfors ; S. Lombardi ; F. Longo ; M. Lopez ; R. Lopez-Coto ; A. Lopez-Oramas ; E. Lorenz ; I. Lozano ; M. Makariev ; K. Mallot ; G. Maneva ; N. Mankuzhiyil ; K. Mannheim ; L. Maraschi ; B. Marcote ; M. Mariotti ; M. Martinez ; D. Mazin ; U. Menzel ; J. M. Miranda ; R. Mirzoyan ; A. Moralejo ; P. Munar-Adrover ; D. Nakajima ; A. Niedzwiecki ; K. Nilsson ; K. Nishijima ; K. Noda ; R. Orito ; A. Overkemping ; S. Paiano ; M. Palatiello ; D. Paneque ; R. Paoletti ; J. M. Paredes ; X. Paredes-Fortuny ; M. Persic ; J. Poutanen ; P. G. Prada Moroni ; E. Prandini ; I. Puljak ; R. Reinthal ; W. Rhode ; M. Ribo ; J. Rico ; J. Rodriguez Garcia ; S. Rugamer ; T. Saito ; K. Saito ; K. Satalecka ; V. Scalzotto ; V. Scapin ; C. Schultz ; T. Schweizer ; S. N. Shore ; A. Sillanpaa ; J. Sitarek ; I. Snidaric ; D. Sobczynska ; F. Spanier ; V. Stamatescu ; A. Stamerra ; T. Steinbring ; J. Storz ; M. Strzys ; L. Takalo ; H. Takami ; F. Tavecchio ; P. Temnikov ; T. Terzic ; D. Tescaro ; M. Teshima ; J. Thaele ; O. Tibolla ; D. F. Torres ; T. Toyama ; A. Treves ; M. Uellenbeck ; P. Vogler ; R. Zanin ; M. Kadler ; R. Schulz ; E. Ros ; U. Bach ; F. Krauss ; J. Wilms
    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-11-08
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Voss, M. ; Lier, C. ; Menzel, U. ; Bärwolff, A. ; Elsaesser, T.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Laser radiation from GaAs/AlGaAs laser diode arrays of high output power is studied during nano- to millisecond carrier injection in temporally and spectrally resolved emission measurements. A red shift of the multimode emission spectrum by up to 12 nm and a concomitant increase of the total bandwidth are caused by a transient rise of the device temperature by up to 50 K. Spatially resolved experiments reveal a lateral temperature difference of about 2 K between the center and the edge emitters. Different laser array/heat sink combinations are investigated in order to reduce the transient temperature increase. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.360900

    Articles: DFG German National Licenses
  3. 3
    Tomm, J. W. ; Bärwolff, A. ; Menzel, U. ; Voss, M. ; Puchert, R. ; Elsaesser, Th.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Aging properties of AlGaAs high power laser arrays were monitored by photocurrent (PC) measurements. We demonstrate that this method allows a quantitative analysis of the aging process and provides insight into the microscopic degradation mechanisms. In graded index separate confinement heterostructures, the PC spectra in the spectral range of the laser transition display a substantial current decrease with aging. This is attributed to enhanced rates of surface recombination and defect generation in the graded gap region. In contrast, step index structures exhibit a much smaller change of PC. The PC results are complemented by measurements of low-frequency laser current noise and front facet temperature. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.364256

    Articles: DFG German National Licenses
  4. 4
    Puchert, R. ; Bärwolff, A. ; Menzel, U. ; Lau, A. ; Voss, M. ; Elsaesser, T.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Temperature profiles in the bulk and at the front facet of a 20 emitter GaAs/AlGaAs double-quantum-well laser array are studied by spatially resolved luminescence and micro-Raman spectroscopy. For optical output powers of about 1 W, the facet temperature of the individual emitters differs by up to 90 K. In contrast, the temperature distribution inside the resonator is highly uniform with temperature differences of less than 2 K. The facet temperature distribution correlates with the near-field intensity pattern of the laser array. Reabsorption of laser emission close to the facet and subsequent surface recombination of the photogenerated carriers represent the main heating mechanism. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.363606

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Chromosome 21 is the smallest human autosome. An extra copy of chromosome 21 causes Down syndrome, the most frequent genetic cause of significant mental retardation, which affects up to 1 in 700 live births. Several anonymous loci for monogenic disorders and predispositions for common complex ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/35012518

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Nature 405, 311— 319; 2000. The name of one author, Y. Groner, was inadvertantly omitted from the author list but is included above. He is affiliated with the Department of Molecular Genetics and Human Genome Center, ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/35024135

    Articles: DFG German National Licenses
  7. 7
    Puchert, R. ; Menzel, U. ; Bärwolff, A. ; Voβ, M. ; Lier, Ch.
    Springer
    Published 1997
    Staff View
    ISSN:
    1572-8943
    Keywords:
    finite element method ; semiconductor laser ; temperature distribution
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The thermal behaviour of high-power GaAlAs/GaAs laser arrays is described by a comprehensive thermal two-dimensional finite-element model which takes several heat sources into account. The influence of these different heat sources on the two-dimensional temperature distribution in the laser array has been investigated. The power densities of the heat sources related to the active region were calculated by an analytic description of the temperature dependent processes as spontaneous emission, Auger recombination and interface recombination. The results of our numerical calculation show, that the local distribution of the heat sources has a strong influence on the lateral temperature profile and on the maximum temperature in the active region of the array, i.e. on the thermal resistance. The calculated temperature profiles are in a good agreement with the measured lateral temperatures at different injection currents and heat sink temperatures. The difference between calculated and measured maximum temperature is lower than 0.75°C.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01983437

    Articles: DFG German National Licenses