Temperature dependence of electroabsorption dynamics in an InAs quantum-dot saturable absorber at 1.3 μm and its impact on mode-locked quantum-dot lasers

Cataluna, Maria Ana; Malins, D. B.; Gomez‐Iglesias, Alvaro; Sibbett, W.; Miller, A.; Rafailov, Edik U.

doi:10.1063/1.3489104

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…The LI curve at 44 • C represents the transition. A similar transition from pulsed (mode-locked in their case) operation to bistability was observed in two-section QD lasers [25] and might be related to a decrease of absorption recovery time and hence an increase in saturation power with temperature [26]. In general, a close connection between self-pulsing and bistability is well known for saturable absorber dynamics [5,22].…”

Section: B Beam Profile and Temperature Dependencementioning

confidence: 67%

Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations

Tierno

Radwell

Ackemann³

2011

Phys. Rev. A

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Self-sustained pulsations in the output of an InAs quantum dot laser diode in the MHz range are reported. The characteristics (shape, range, and frequency) are presented for the free-running laser and when optical feedback in the Littrow configuration is applied. Bistability in the light-current characteristics is observed for operating wavelengths smaller than the gain peak, but it is not present for wavelengths above the gain peak and for the free-running laser, except at elevated temperatures. The temporal evolution of the envelopes of the optical spectra is very different for operation below, around, and above the gain peak, which might be related to a change of phase-amplitude coupling across the gain maximum, in agreement with the expectation for a two-level system. The time scale and the bifurcation scenario, supported by an initial blueshift of the emission wavelength of each longitudinal mode in time-resolved optical spectra, suggests that these are optothermal pulsations similar to those reported in quantum well amplifiers [Phys. Rev. E 68, 036209 (2003)]. The mechanism of pulsation seems to be a destabilization of bistable states (due to saturable absorption in the beam wings) by a slow thermal change in the waveguiding properties

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Section: B Beam Profile and Temperature Dependencementioning

confidence: 67%

Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations

Tierno

Radwell

Ackemann³

2011

Phys. Rev. A

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“…Quantum dot thermionic emission processes depend upon the QD confinement energy; however, they are in general comparable or faster than the exciton recombination time at room temperature for InAs/GaAs QDs with relatively deep confinement . Therefore, under room temperature conditions, the intersubband response is expected to be extremely small.…”

Section: Resultsmentioning

confidence: 99%

The role of intersubband optical transitions on the electrical properties of InGaAs/GaAs quantum dot solar cells

Jolley

Fu²,

Lü³

et al. 2012

Progress in Photovoltaics

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We report on an experimental study of the intersubband optical response of an In0.5Ga0.5As/GaAs quantum dot solar cell (QDSC). By calculating the quantum dot absorption cross section, the strength of the intersubband optical transitions is gauged, and their importance and influence on the electrical properties of the solar cell can be compared with those of other physical processes such as thermal intersubband and optical interband transitions. The temperature‐dependent photocurrent and dark current characteristics of the QDSC have also been analyzed in detail, leading to an understanding of the specific effects reducing the open‐circuit voltage. The deviation of QDSCs from idealized models is discussed, and some conditions required for an improved open‐circuit voltage are suggested. Copyright © 2012 John Wiley & Sons, Ltd.

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“…6 Furthermore, semiconductor QD-based saturable absorbers exhibit much better performance than their quantum well and bulk counterparts owing to their large saturable absorption (SA) induced by quantum confinement effect. 7 Up till now, the third-order nonlinearities of II-VI QDs including CdSe, CdS, and CdTe QDs have been studied in detail. 1,2,8 However, the inherent cytotoxicity of cadmium-based QDs casts doubt on their practical applications, especially in biological and biomedical areas.…”

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confidence: 99%

Near resonant and nonresonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots

Wang

Yang

et al. 2013

Applied Physics Letters

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We have investigated the third-order optical nonlinearities of high-quality colloidal InP/ZnS core-shell quantum dots (QDs) using Z-scan technique with femtosecond pulses. The two-photon absorption cross-sections as high as 6.2 × 103 GM are observed at 800 nm (non-resonant regime) in InP/ZnS QDs with diameter of 2.8 nm, which is even larger than those of CdSe, CdS, and CdTe QDs at similar sizes. Furthermore, both of the 2.2 nm and 2.8 nm-sized InP/ZnS QDs exhibit strong saturable absorption in near resonant regime, which is attributed to large exciton Bohr radius in this material. These results strongly suggest the promising potential of InP/ZnS QDs for widespread applications, especially in two-photon excited bio-imaging and saturable absorbing. © 2013 American Institute of Physics

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Temperature dependence of electroabsorption dynamics in an InAs quantum-dot saturable absorber at 1.3 μm and its impact on mode-locked quantum-dot lasers

Cited by 19 publications

References 11 publications

Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations

Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations

The role of intersubband optical transitions on the electrical properties of InGaAs/GaAs quantum dot solar cells

Near resonant and nonresonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots

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