Single and multiple Ga0.4In0.6P/(Al0.4Ga0.6)0.5In0.5P quantum wells have been grown using atmosph... more Single and multiple Ga0.4In0.6P/(Al0.4Ga0.6)0.5In0.5P quantum wells have been grown using atmospheric pressure organometallic vapor phase epitaxy. The Ga0.4In0.6P well layers are coherently strained to match the lattice parameter of the GaAs substrate. Transmission electron microscopic results showed that the quantum-well layers are very uniform in thickness and the interface is abrupt and free of misfit dislocations. The photoluminescence peak energy increases as the well width decreases, due to carrier confinement in the quantum well. Growth interruptions do not change the photoluminescence peak energy of the quantum well. However, the photoluminescence intensity is drastically reduced for longer growth interruption times. Higher-order x-ray diffraction satellite peaks and a narrow photoluminescence halfwidth are observed in a 20-layer multiple-quantum-well sample, indicative of high structural uniformity and precise control of the composition and thickness during the growth proce...
The addition of photonic-crystal structures to long-wavelength vertical-cavity surface-emitting l... more The addition of photonic-crystal structures to long-wavelength vertical-cavity surface-emitting lasers can increase single-mode ' output power to more than 3 mW, and could lead to more than 10 mW levels at shorter wavelengths.
Abstract We report 35 GHz passive mode-locking and 20 GHz hybrid mode-locking of quantum dot (QD)... more Abstract We report 35 GHz passive mode-locking and 20 GHz hybrid mode-locking of quantum dot (QD) lasers at 1.3 µm. Our investigations show ultrafast absorber recovery times and for the first time transform-limited mode-locked pulses.
... Katsuo (Cwisno: 6069). Technical University of Denmark, Research Center COM, Systems. Email: ... more ... Katsuo (Cwisno: 6069). Technical University of Denmark, Research Center COM, Systems. Email: ---. Author: Mørk, Jesper (Cwisno: 6068). Technical University of Denmark, Research Center COM, Optoelectronics. Email: ---. Author ...
By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initi... more By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initial coherence and dephasing of quasi two-dimensional excitions and biexcitons in GaAs multiple quantum wells. The dephasing has contributions from phonon scattering, interface-roughness scattering and exciton-exciton scattering. Inhomogeneous broadening and generation of coherent wavepackets play a significant role in the coherent exciton dynamics. The incoherent exciton dynamics,
Single and multiple Ga0.4In0.6P/(Al0.4Ga0.6)0.5In0.5P quantum wells have been grown using atmosph... more Single and multiple Ga0.4In0.6P/(Al0.4Ga0.6)0.5In0.5P quantum wells have been grown using atmospheric pressure organometallic vapor phase epitaxy. The Ga0.4In0.6P well layers are coherently strained to match the lattice parameter of the GaAs substrate. Transmission electron microscopic results showed that the quantum-well layers are very uniform in thickness and the interface is abrupt and free of misfit dislocations. The photoluminescence peak energy increases as the well width decreases, due to carrier confinement in the quantum well. Growth interruptions do not change the photoluminescence peak energy of the quantum well. However, the photoluminescence intensity is drastically reduced for longer growth interruption times. Higher-order x-ray diffraction satellite peaks and a narrow photoluminescence halfwidth are observed in a 20-layer multiple-quantum-well sample, indicative of high structural uniformity and precise control of the composition and thickness during the growth proce...
The addition of photonic-crystal structures to long-wavelength vertical-cavity surface-emitting l... more The addition of photonic-crystal structures to long-wavelength vertical-cavity surface-emitting lasers can increase single-mode ' output power to more than 3 mW, and could lead to more than 10 mW levels at shorter wavelengths.
Abstract We report 35 GHz passive mode-locking and 20 GHz hybrid mode-locking of quantum dot (QD)... more Abstract We report 35 GHz passive mode-locking and 20 GHz hybrid mode-locking of quantum dot (QD) lasers at 1.3 µm. Our investigations show ultrafast absorber recovery times and for the first time transform-limited mode-locked pulses.
... Katsuo (Cwisno: 6069). Technical University of Denmark, Research Center COM, Systems. Email: ... more ... Katsuo (Cwisno: 6069). Technical University of Denmark, Research Center COM, Systems. Email: ---. Author: Mørk, Jesper (Cwisno: 6068). Technical University of Denmark, Research Center COM, Optoelectronics. Email: ---. Author ...
By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initi... more By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initial coherence and dephasing of quasi two-dimensional excitions and biexcitons in GaAs multiple quantum wells. The dephasing has contributions from phonon scattering, interface-roughness scattering and exciton-exciton scattering. Inhomogeneous broadening and generation of coherent wavepackets play a significant role in the coherent exciton dynamics. The incoherent exciton dynamics,
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Papers by Dan Birkedal