Search Results - "Birkedal, D"

Long lived coherence in self-assembled quantum dots by Birkedal, D, Leosson, K, Hvam, J M

“…We report measurements of ultralong coherence in self-assembled quantum dots. Transient four-wave mixing experiments at 5 K show an average dephasing time of…”
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Femtosecond Spectral Interferometry of Resonant Secondary Emission from Quantum Wells: Resonance Rayleigh Scattering in the Nonergodic Regime by Birkedal, D., Shah, J.

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Ultrafast gain dynamics in quantum-dot amplifiers: theoretical analysis and experimental investigations by van der Poel, M., Gehrig, E., Hess, O., Birkedal, D., Hvam, J.M.

“…Ultrafast gain dynamics in an optical amplifier with an active layer of self-organized quantum dots (QDs) emitting near 1.3 /spl mu/m is characterized…”
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Binding of quasi two-dimensional biexcitons by Birkedal, D., Singh, J., Lyssenko, V.G., Hvam, J.M.

“…Summary form only given. In this presentation we report on a determination of the biexciton binding energies in GaAs-AlGaAs quantum wells of different widths…”
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Low-jitter and high-power 40-GHz all-active mode-locked lasers by Yvind, K., Larsson, D., Christiansen, L.J., Angelo, C., Oxenlwe, L.K., Mrk, J., Birkedal, D., Hvam, J.M., Hanberg, J.

“…A novel design strategy for the epitaxial structure of monolithic mode-locked semiconductor lasers is presented. Using an all-active design, we fabricate…”
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Femtosecond dynamics and absorbance of self-organized InAs quantum dots emitting near 1.3 μm at room temperature by Birkedal, D., Bloch, J., Shah, J., Pfeiffer, L. N., West, K.

“…High-sensitivity, femtosecond differential transmission measurements on self-organized InAs quantum dots at room temperature allow us to determine the dynamics…”
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Homogeneous linewidth of self-assembled III–V quantum dots observed in single-dot photoluminescence by Leosson, K., Birkedal, D., Magnusdottir, I., Langbein, W., Hvam, J.M.

“…We report photoluminescence emission from single self-assembled InAlGaAs quantum dots, which is broadened purely by dephasing processes. We observe linewidths…”
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Heterodyne technique for measuring the amplitude and phase transfer functions of an optical modulator by Romstad, F.P., Birkedal, D., Mork, J., Hvam, J.A.

“…We propose a technique based on heterodyne detection for accurately and simultaneously measuring the amplitude and phase transfer functions of an optical…”
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Structural and electrooptical characteristics of quantum dots emitting at 1.3 μm on gallium arsenide by FIORE, Andrea, OESTERLE, Ursula, CANTONI, Marco, BOBARD, Fabienne, STANLEY, Ross P, HOUDRE, Romuald, LELARGE, Francois, ILEGEMS, Marc, BORRI, Paola, LANGBEIN, Wolfgang, BIRKEDAL, D, HVAM, Jørn M

“…We present a comprehensive study of the structural and emission properties of self-assembled InAs quantum dots emitting at 1.3 mu m. The dots are grown by…”
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Continuum contribution to excitonic four-wave mixing due to interaction-induced nonlinearities: A numerical study by El Sayed, K., Birkedal, D., Lyssenko, V. G., Hvam, J. M.

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Dephasing in Self-organized InAlGaAs Quantum Dots by Leosson, K, Birkedal, D, Hvam, J M

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Effect of annealing on the structure and optical properties of InGaAs/GaAs quantum dots by Xu, Z.C., Leosson, K., Birkedal, D., Hvam, J.M., Sadowski, J., Zhao, Z.Y., Chen, X.S., Liu, Y.M., Yang, K.T.

“…The change of phonon energies of annealed InGaAs/GaAs quantum dots (QDs), was observed using selectively excited photoluminescence. X-ray diffraction and…”
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Experimental Investigation of Quantum Effects in Time-Resolved Resonant Rayleigh Scattering from Quantum Well Excitons by Birkedal, D., Shah, J., Shchegrov, A.V., Pfeiffer, L.N.

“…Resonant Rayleigh scattering from quantum well excitons is investigated using ultrafast spectral interferometry. We isolate the coherent Rayleigh scattering…”
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Terahertz radiation from delta-doped GaAs by Birkedal, D., Hansen, O., So/rensen, C. B., Jarasiunas, K., Brorson, S. D., Keiding, S. R.

“…Terahertz pulse emission from four different delta-doped molecular beam epitaxially grown GaAs samples is studied. We observe a decrease of the emitted THz…”
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Binding energy of two-dimensional biexcitons by Singh, J, Birkedal, D, Lyssenko, VG, Hvam, JM

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Binding energy of two-dimensional biexcitons in type-II superlattices by Singh, Jai, Birkedal, D., Lysenko, V.G., Hvam, J.M.

“…Using a model structure for a two-dimensional (2D) biexciton in a type-II superlattice, it is shown that the form of its Hamiltonian can be reduced to a 2D…”
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Interband coherence in semiconductors; excitons and beyond by Hvam, J.M., Birkedal, D., Mizeikis, V., El Sayed, K.

“…Spectrally resolved transient four-wave mixing is studied in GaAs/AlGaAs quantum wells for coherent excitation of exciton and continuum states. A distinct…”
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Exciton-exciton collisions and conversion of interwell excitons in GaAs/AlGaAs superlattices by Filin, A. I., Timofeev, V. B., Gubarev, S. I., Birkedal, D., Hvam, J. M.

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Ultrafast exciton dynamics in semiconductors: Effects of disorder and confinement by Hvam, J. M., Lyssenko, V. G., Birkedal, D., Erland, J.

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High-resolution spectroscopy of matrix-isolated fullerene molecules by Starukhin, A.N., Razbirin, B.S., Chugreev, A.V., Nelson, D.K., Grushko, Yu.S., Kolesnik, S.N., Hvam, J.M., Birkedal, D., Litvinenko, K., Spiegelberg, C., Zeman, J., Martinez, G.

“…We have offered a method of obtaining fine-structured vibronic spectra of fullerenes. At liquid-helium temperatures tens of narrow lines with half-width ≈ 0.5…”
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