Observations of near-zero linewidth enhancement factor in a quantum-well coupled quantum-dot laser

Kondratko, Piotr Konrad; Chuang, Shun‐Lien; Walter, G.; Chung, T.; Holonyak, N.

doi:10.1063/1.1631397

Cited by 82 publications

(45 citation statements)

References 7 publications

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“…. 5 are commonly measured, the measured α-factors in quantum-dot lasers range from near-zero [NEW99a,KON04a,ALE07] to very high values [DAG05], and even "infinite" α [CON07,GRI08a]. Furthermore, a strong dependence on the pump current has been observed [SU05a,JIA12].…”

Section: Amplitude-phase Coupling In Quantum-dot Lasersmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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In this thesis the dynamics and performance of optoelectronic devices based on semiconductor quantum-dots are investigated.In the first part, the dynamics of quantum-dot lasers under external perturbations is discussed. Using a microscopically based balance equation model that incorporates detailed charge-carrier scattering dynamics and the possibility to describe nonequilibrium between intra-band electronic states, the relaxation oscillations of the quantum-dot laser are investigated. Three qualitatively different dynamic regimes are identified in dependence of the scattering rates -the "constantreservoir" regime for slow scattering, the "overdamped" regime, and the "synchronized" regime for high scattering -characterized by a varying degree of nonequilibrium between the quantum-dot and reservoir states.Important differences to conventional lasers are found in the modulation response and the dynamics in optical injection and feedback setups. Common theoretical models and approaches used to describe these applications are shown to yield inaccurate predictions, especially in the "constant-reservoir" and "overdamped" dynamic regimes. An important consequence is that the amplitude-phase coupling in quantum-dot lasers, commonly described by the α-factor, differs from conventional descriptions due to the desynchronization of gain and refractive index. While the α-factor describes bifurcations of fixed points accurately, it fails in describing dynamic solutions and overestimates the extent of complex dynamics. The observed low sensitivity to optical perturbations in quantum-dot lasers can therefore be attributed partly to the charge-carrier nonequilibrium. Three quantum-dot laser models on different levels of sophistication are presented that can accurately describe the quantum-dot nonequilibrium dynamics.In the second part of the thesis, the performance of quantum-dot semiconductor optical amplifiers is investigated, and two types of applications unique to quantum-dots as active medium are discussed. The ground and excited states of the quantum-dots allow an ultra-broad-band amplification of optical data streams. Amplified signals on the ground-state frequencies are shown to generally exhibit higher quality than on the excited state, due to a lower sensitivity of the groundstate to carrier-density variations. Nevertheless the quantum-dot amplifier is found to allow effective amplification on both frequency ranges. Furthermore, a parameter range is identified that allows for a simultaneous amplification of data signals on the ground and excited state in a counter-propagating setup.The long microscopically polarization dephasing times in quantum-dots are found to enable quantum-coherent interactions on a macroscopic scale at room-temperature. By comparison with experiments, the occurrence of Rabi-oscillations by amplification of ultra-short pulses is demonstrated. Quantum-dot based devices could therefore be used for future applications based on quantum-coherent effects.

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Section: Amplitude-phase Coupling In Quantum-dot Lasersmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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“…9-11, to suppress the recombination outside QDs and thus to improve the temperature-stability of the laser, tunneling-injection of both electrons and holes into QDs was proposed from two separate QWs. There have been recent experimental developments [12][13][14][15] related to this concept.…”

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confidence: 99%

“…13 A more symmetrical gain shape and a smaller refractive index change at the peak gain wavelength were reported for a tunneling-injection laser. 15 Here, we study the potential of tunneling-injection of both electrons and holes into QDs for high-power operation and develop an extended model for a realistic device. The energy band diagram of the structure is shown in Fig.…”

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confidence: 99%

Tunneling-injection of electrons and holes into quantum dots: A tool for high-power lasing

Han

Asryan

2008

Applied Physics Letters

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“…The measurement of has been a challenging issue that has also attracted extensive research [23]- [29]. Due to the connection between the OFSMI 0018-9197/$25.00 © 2009 IEEE waveform and , OFSMI-based approaches have been proposed for measurement [16]- [18].…”

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confidence: 99%

Optical Feedback Self-Mixing Interferometry With a Large Feedback Factor $C$: Behavior Studies

Chicharo

et al. 2009

IEEE J. Quantum Electron.

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This paper studies the behavior of optical feedback self-mixing interferometric (OFSMI) systems, where the semiconductor lasers operate at a single mode (perturbed external cavity mode) with a large optical feedback factor C. Based on analysis of the spectral linewidth associated with all the possible lasing modes at different C values, a set of mode jumping rules are proposed following the minimum linewidth mode competition principle proposed in . According to the rules, the C factor can be classified into different regions, on which an OFSMI system will exhibit distinct phenomena. In particular, for the same amount of displacement associated with the external cavity, the fringe number reduction on the OFSMI signal should be observed when C increases from one region to the next. An experimental setup with a laser diode HL7851G was implemented and employed to verify the proposed rules. The behavior of the OFSMI predicted by the paper has been confirmed by the experiments with C value up to 8.0. Disciplines Physical Sciences and Mathematics Publication DetailsYu, Y., Xi, J., Chicharo, J. . According to the rules, the factor can be classified into different regions, on which an OFSMI system will exhibit distinct phenomena. In particular, for the same amount of displacement associated with the external cavity, the fringe number reduction on the OFSMI signal should be observed when increases from one region to the next. An experimental setup with a laser diode HL7851G was implemented and employed to verify the proposed rules. The behavior of the OFSMI predicted by the paper has been confirmed by the experiments with value up to 8.0.Index Terms-Mode competition, optical feedback factor, optical feedback interferometry, self-mixing effect, semiconductor laser (SL).

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Observations of near-zero linewidth enhancement factor in a quantum-well coupled quantum-dot laser

Cited by 82 publications

References 7 publications

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Tunneling-injection of electrons and holes into quantum dots: A tool for high-power lasing

Optical Feedback Self-Mixing Interferometry With a Large Feedback Factor $C$: Behavior Studies

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